Huh? iOS doesn't use pixel mapping, so I don't think this can be true. Apps are displayed exactly the same, whether it's retina or not.
"Exactly" the same? That makes no sense, many many apps were updated when the retina iPad came out and the images got clearer. You're telling me there are
not ANY programs where the text is smaller on a retina iPad vs. a non-retina. That's quite a few programs...
Some icons were replace with 2x images and if those images had words (not text, bitmapped words) on them (not saying they should but some did) and they didn't quadruple words in size (2 in both directions), they'd be smaller (or they might have changed "info" to "information", resulting in smaller text).
My iPhone-only apps are a whole lot easier to read on my iPad when running at 2x. Because they think they're running on a smaller device.
Also, the text is way easier to read on RunPee on my retina iPhone, than on my retina iPad (and it's a dual app) but even the RunPee large font is crazy small on my iPad. I don't know what they're doing, but I don't even bother to use it any more, I'll get up and grab my iPhone because it's easier to read.
(The text on Galileo maps used to be too small on the retina iPad too, this was apparent comparing two devices side by side, but they've added a font size option now).
I'm not saying these aren't app issues, but as a user, they become my issues if I can't read them.
My point was if I could force force my iPad to think I had a smaller device, things would be larger when I enlarged it. (I don't think that I'll be able to tell my iPad that, but that's what my original post was about).
Gary