> "Try a different smaller form factor every couple of years" is a reasonable strategy. First Mini, then Air.

The iPhone air has a 6.5" display. That's bigger than the base iPhone 17 (6.3") and the iPhone 17e (6.1")

You're probably thinking about the thinness of the phone. iPhone air is 2.4mm thinner than iPhone 17, but I don't think anyone is asking for that, as most people use a case which makes the phone thicker.