Don't believe Apple's line about pixels not being visible at retina dpis. Single-pixel slivers of geometry are still very visible in non-AA 2x resolution, and much more annoying (for me at least) than the smoother lower res with antialiasing.

I can't see any pixels on the 1080p Nexus 7 screen, even holding it up close to my face and staring, but that's higher DPI than Retina.

Well, supersampling is the naive form of anti-aliasing, which is effectively rendering at a higher resolution then resizing down.