Chills

This is not so.  Apple is VERY heavily embedded in professional graphics. Photo and publishing world.  A very high number of those users will want Affinity.  
This is not the case with the average Android user.   So whilst on Tablets it might be 50/50 market share for those likely to buy Affinity it is probably 50% of the Apple users and 5% of the Android users.  (random numbers for illustration only)   
Should Android tablets take the graphics/media/photo/publishing worlds by storm, then you could expect Affinity on Android.

Thanks for showing you don't understand the problem.  Most Linux advocates either don't or are just disingenuous.
This also highlights why Affinity is unlikely to ever support Linux.

OK let me explain.  I will use Apple as you cited it, but it is the same for MS Windows.
The 5 versions of the OS you cited are linear. That is: they came one after the other.
Affinity/Serif/Canva will be part of the Apple (and MS)  developer program and under NDA will see the OS roadmap for several years in advance.
They will have some input. They will also have access to Developer, Alpha and Beta versions of the upcoming OS long before the public see them.
There is a well controlled API for the OS  ( I note that whilst Apple OS is POSIX Certified the note for Linux is "most" distributions "mostly comply"  So even for the base API some Linux sort of comply. )  The API changed for OSX/IOS (and Windows) will be planned long in advance and there is usually compatibility information between versions.
Therefore for Apple and Microsoft, who cover over 90% of the market, Affinity have a clear 2-year roadmap, a solid API, advanced notice and testing phase of all changes before the public gets them. 
For Linux which covers 3-4% of the market they have no advanced visibility of the kernel not the nor the 1000s of additional packages that asynchronously make up the 100s of different Linux's.
When you said "look 5 OS's"  that is 5 sequential versions a procession.   With Linux at any one time there are a few 100 in parallel!  All different and all changing asynchronously.
People often cite Blackmagic Design and Resolve. That ran on ONE Linux only.  And I mean one version of one distribution AS SUPPLIED by BMD.    They had total control of the one version of Linux, and it came pre-installed on the computer with Resolve.   This was in the day when it came in packages from $10,000 to $800,000 a seat!  And it was dongleed. Originally Resolve was on UNIX computers and thus had a POSIX API the Linux they picked was also mostly a POSIX API, and they could modify the Linux  heavily.
The versions of Resolve you could just buy and install yourself, without buying a computer and other hardware from BMD, were first done on Apple Mac (for obvious reasons it is a POSIX OS)  then on Windows.  Finally, a few years later they made the Linux version available stand alone though it had some codecs missing, and it was, and to this day only for one specific Linux (and one version of that distro) 
In the last year or so that one version went End Of Life. So BMD have ported Resolve to ONE other specific distribution (and version).  IF you rock up on the BMD forum with a problem, and you are running Linux:  if you are not on one of the two specific Linux versions they support the response is "We only support X and Y Linux It says so in the documentation so install one of them. "  Also that it is only advised to install Y ans X is EOL.  They won't give any support.
Some have suggested a Linux FlatPak Version for Resolve, but that is not looking likely. It appears to be far more work than can be justified for the sales. And BMD do know their market. This is why it is highly unlikely to ever be a Linux version of any affinity tools.  
 

On the contrary, Linux users always greatly overestimate the number of Linux users and heavily underestimate the amount of work.  
I worked with a company that supported people targeting various systems from bare metal to all types of OS. If you were targeting Linux, they automatically added 10% to the cost for additional support.  The many 100s of Linux distributions are flakey and asynchronously changing. It is a complete nightmare.
The number of users is around 2-4% of the overall desktop market. Of that number, those who would pay for infinity is a going to be less than 1% of the total market but the cost for maintaining a (single) Linux distribution will be higher than for any other OS.
 

You upgraded in hopes that Affinity would be available on Linux at some point? Not the best way to go about buying software, especially when the developers have said "no" to making a Linux version. Pretty safe bet there is no Linux version in the near future, or later future. 

I agree with your points and would also have said, "there is no amount of money that you could pay me to shoot a wedding. " Though if the money were enough to immigrate to somewhere nice with no extradition and live comfortable for life, with cash upfront, I might consider it. Once. Otherwise, like you, weddings are a firm NO!!!

I regard weddings as more dangerous than conflict photography (excluding Israel when they target journalists).
 

On the roadmap, it is a new version of the same thing.  The specifications and design are updated. It is not uncommon to start with a clean code base for many reasons, change of language, change of tools.   simply wanting a clean sheet.  Its not all about the code. 

Indeed, it would and the point is a DAM  not just a photo catalogue.  APhoto is one of three apps and what is needed is a "Light-Bridge" type system.  I suspect since the initial comments from Serif with Affinity V1 the scope and specification of the "Lightroom" they suggested they might be working on has changed somewhat.

On the roadmap, it is a new version of the same thing.  The specifications and design are updated. It is not uncommon to start with a clean code base for many reasons, change of language, change of tools.   simply wanting a clean sheet.  Its not all about the code. 

THAT is so funny.   You seem to be under the misapprehension that the source code is the product and the product is the source code!  That is only true in a naive and narrow sense.  I have seen Software systems change programming languages, not just source code, in the middle of their life.   Also changed target MCU. 

How many times does it have to be repeated that Affinity IS NOT an update of PagePlus? They are two completely separate pieces of software, the only link being that they were both developed by Serif. It's a bit like saying that a Ford Mustang is just an updated Model T Ford!

These are the primary reasons why I went back to Lightroom and Photoshop.  They both use Camera Raw and the round trip between them is trivial...  What shocked me when I made my way back to Adobe (which I hated to do) is how much more capable Photoshop is than Affinity Photo.
Even without Affinity Develop (a light room competitor), it is completely absurd that a graphic suite that is being used by a significant number of graphic design professionals doesn't have an DAM.

I am not sure that Affinity/Serif/Canva has no intention of producing a DAM. I suspect a Light-Bridge ie a DAM that has Lightroom type features and integrates into the three Affinity apps is a major step, and onto a moving target.  It isn't trivial, and takes a lot of effort.  I think that they may have planned it for V2 as you will need to modify the three current apps.  So I would think that it would launch with V3?

Likewise.

Because Serif said they were working on one, and it would be in beta soon...  Early in V1s cycle...  (I took them at their word, my mistake)
I already returned to Adobe primarily using Lightroom and Photoshop.  The shocking part about Photoshop is it is lightyears ahead of Affinity Photo.  Had Serif released Affinity Develop and Affinity DAM, I would have happily stayed with them.  But you couldn't drag me back now...

Recently (November 2023) in another place, a video editor was giving his reasons to come off Adobe Sw.  Various replacements were suggested, including Affinity, for the usual apps and reasons. (also Resolve for Video Editing)
The ONLY thing people can't find a good replacement for is Lightroom. 
Lightroom is a photo-management tool.   A catalogue system.   If Serif do a photo-catalouge system that works with Photo it would be a winner.  Many , like me are still on Lightroom 6.14 which was the last stand alone perpetual licence before CC. Certainly, all the world's photo-journalists love Lightroom.
 

And I don't expect the software I purchase to improve after I buy it, but I guess I have low expectations.
Having said that, on several occasions I have been quite pleasantly surprised by synth manufacturers making major improvements to the hardware I bought through free OS and or firmware upgrades.

No, but at no time have they said no to the continual requests for a Lightroom or DAM type program that ties the three apps together.
We all buy the software for what it does now but recognize that software companies continually develop, usually in the direction the customers request.
Hence, a section of this forum called "feature requests"

That made me laugh!  
User feed back changes ALL software, not just Open Source. 
However, for Open Source it is a curse for the obvious reasons.
As for an affinity Lightroom: this has evolved over time, as most Affinity users would want a Light-Bridge DAM.  Affinity does 3 programs, Publisher, Designer and photo.   Which I use in that order, Photo the least.   The Publisher and designer users need a DAM more than a photo catalogue, though they need that too.       
A Light-Bridge app would tie all three main programs together. Most of us probably would not want a face recognition, though it would be useful.
 

As a point of principal, being a journalist, I won't block people, including @Bit Disappointed  no matter what I think of him.

I see what you did there!
I do find it slightly odd that there was a comment about ‘MAC’ but no mention of ‘IPad’ (with a capital I) in the same sentence.

No one cares unless talking about network connections on Apple computers.   MAC/Mac are interchangeable in the context of this discussion.
We all hope there will be more resources for Affinity under Canva, though the VERY long thread on Affinity/Canva in this forum is worried about the direction of those resources. Conspiracy theories abound! (eg next week Affinity will all be a web based subscription model...  🙂) However, I agree, as with Adobe and many others, the Linux market is far too small and fractured to be commercially viable for these apps.
 

"Please consider Linux as a viable platform"
Definitely No, or Affinity development will drop even more than its is now. They have very small team which have to deal with Mac version, Windows versions, IPad versions, updates and so on. Every platform consumes devs resources (develop, manage, test, support and so on). Development of Affinity is miserable and you want additionally scatter their resources to another platform? platform who almost no one need except a few (but loud on internet) linux geeks? Besides, linux users has mentality to have everything in repo and "for free". I see these milions of linux users running to buy Affinity :p.  BTW  Mac platform is developed because Mac's was from ages standard  for graphics stations in studios all around the world.

It would help a lot. Until then the work-around may be to export a document from MSPublisher to InDesign?

As one of those senior citizens - I'm 67 this year - you might find that a lot of senior citizens are already here.  There's a subculture that does Pattern Design and I think this might have emigrated from PaintShop Pro which was used a lot for fabric embroidery.

Back in the day (early 90s) when I was still in the Public Service, I worked in one of the Australian Bureau of Statistics state branches as a publishing assistant. We'd put out statistical journals and the State Year Book. The software we used was mainframe app (the name of which escapes me) that stored every keyboard command and would recreate the last version of a document by editing it from the last mainframe  save by replaying the keystrokes used to edit it! In the Publishing section though we mostly used a DOS version of MS WORD, and VENTURA DESKTOP PUBLISHER (Now Corel Ventura) which run on GEM under DOS!  It was good enough for most journals and the Year Book, though everything was geared towards correcting subject matter (too much jargon) and minor types. We had to get proofs back from the printer and manually check everything! If you needed to make a slight alteration to a chart or diagram, you had to edit the source .ps (or .eps) file! However, as the decade went on most of the of the journals were automated and I eventually left that job to move to the East Coast and start a bachelors in fine art. At that university (at that time) MS Word and Publisher were on most terminals and I was appalled at just how bad MSPubisher was!Much later when I did my Masters they university had swapped over to Adobe. Adobe apps were on every terminal (sometimes downloaded on demand) so I switched to using Photoshop, Illustrator, and InDesign for the graphic novel I was doing back then. InDesign was better than MSPublisher but I never liked using it (and absolutely hated the Illustrator GUI). Much more recently I got sick of using Adobe CS6 apps and constant advertising about The Cloud.  Moving to Affinity was the result and I think that's been a good choice.  I  haven't used Affinity Publisher much yet, but when I have I've the impression that -- unlike Designer -- it hasn't quite reached a "mature level of capability" yet, still focused on advertising, brochures and covers.  It will some day, I'm sure. 

So don't discount all senior citizens. Some of us have been using computers since the mid or late 70s, changed hardware and operating systems (or hacked them) when needed, and learned to use program after program! 

Hallelujah!  At last!
I now have to move a load of Senior Citizens who are welded to it off to Affinity.  It would help if Affinity Publisher could read M$ Publisher files.