Intended, I guess so; correct? not so much.
He wrote "Affinity will show the same thing on both retina / non-retina screens - because that's how retina stuff should work." No; user element stuff (icons, text, etc) should work that way but NOT the work image. Many of us want to proof images 1:1 on different display devices and this mucks that up. Yes, I can understand that relative sized views like "fit" or maybe "Actual" might be the same, but 1:1 (which my math calculates to 100%) should be that: one pixel for one pixel, and is relative to whatever you're displaying on in the sense that different display devices have differently sized pixels.
Granted, some might want to see the same "size" on very different PPI screens, but I think the default should be that 1:1 means what it says. Working with photos is somewhat different from a graphic that doesn't start with a photograph, in that there are no pixels till you put them there. But photo editing is different. The pixels already exist.
And my version of AP does not ever show an image at 1:1 (100%, actual or pixel), nevermind the business of other screens. A 1000x1000 pixel images measures about 9"x9" on my retina iMac in AP. That's really 200%; it should be about 4.5" on a side, as it is in Aperture, Lightroom, Photoshop, Graphic Converter, etc etc. Again, some simple math shows that 1000 pixels is about a fifth of the 5120 px screen, or in inches a fifth of about 23". If was only designing HiDPI graphics this might be nice; I know some folks who always have to work at 200% in Photoshop cuz stuff is so small. But I didn't buy a retina Mac to see everything scaled by default to fit old monitors.
I'm still hoping that something is wrong here with my AP and this isn't how it is supposed to work. When I am looking at an image with pixel unit measurements, I expect those pixels to match the pixels on my screen; using the "pixel view" doesn't do that. There appears to be no way to get there other than to "scale" at 50%, but this leads me to wonder what's going on in the background if AP can't do a proper 1:1 as all my other graphic software can.