Fixx

If you use spiral binding you need bleed in spine part... otherwise bleed should be 0 towards spine.

That should not happen when you open an image. When you have existing document and you add (place, drag&drop) an image to it, it will be placed as image layer, which means you can do all kinds of operations to it nondestructively and it keeps its original resolution within the file. It also means you cannot copy&paste a part of it, only the whole layer. That is problematic behaviour and I wish there was some built-in automatic procedure around it. You can rasterize the placed layer to document resolution and after that it is normal pixel layer and selections can be copy pasted normally.

It should be sticky; as you set it once with one text frame as top (Text>Vertical Alignment) next time you create a text frame it should be aligned top.

OK, check if you have "Area: Whole document" selected in export dialog. It makes difference.

Guys, it is not as simple as you say and you haven't managed to answer OP question. I can draw a design with vector shapes, save it as TIFF with affinity layers. Result will open as simple pixel image in Photoshop. I can open the TIFF in Designer and I get the original vector shapes just like they were when exporting. Why this does not happen with OP is the question.

Separated mode is nice but it tends to lose bars and panels in multiple monitor systems (Mac)...

Why don't you just design the booklet as normal facing pages publication and let printer do the imposition. If you do the printing yourself your printer (the machine) should have booklet option available, or you can use some cheap "imposition" software like Create Booklet 2.

In my view JPEG is delivery format. Sometimes though TIF is preferred delivery format but that depends how big is the job and how much storage and bandwidth is available and of course customer preferences. TIF and PSD are good archive and exchange formats. .afphoto is preferred work format when you are working on an image, having repeated saves and nondestructive tool layers. RAW is the source format and if you have capable raw converter/DAM it is also a good archive format (save original and development sidecar/db instruction set).

I think Insert>Math and Glyph Browser>Math Operators should have the same content. Now they do not. (Though I think Glyph Browser groups are based on some standard which defines plus, multiply and divide NOT math operators... go figure. I just want to add × and ≈ to my texts reliably.)

image layer IS usually a raster image, but it is just packaged as "smart layer" which may prevent some operations like accessing FF.

Certainly picture pinned to body text and caption pinned to picture!

Automatic pinned captions would be great.

Mostly this boils down to if you can do these copy operations without layers. With AP you cannot, but it is really easy to copy selection with CMD-J and merge it back with CMD-E. It is the between these operations which is not too smooth as you cannot just press CMD to get temporary arrow tool, you have to switch to it with V.

Yes, page box options are available in 8 beta.

OS upgrades should be planned carefully to avoid this kind of dead ends... You can probably go back to Mojave if you have suitable TimeMachine version available (you though have to save files added after backup somewhere...planning, planning..) Or you can download 7 day trial of the new InDesign and save all INDD files to IDML. There is a batch script available somewhere in this forum if you have a lot of files (you can probably do a search of all INDD and drop those to the batch). And Markzware....