This is a good piece by Marco Arment, writing about our tastes for bigger phone screens has changed over the last few years—particularly iPhone users:

But mostly, we’ve continued the inevitable progression of phones becoming most people’s primary computing device, rather than a thing in our pocket that’s mostly just for phone calls and messaging. When you only do a few things on your phone and it doesn’t really matter how big the screen is, you don’t demand bigger screens as much and it’s nice for the phone to be as small as possible. But bigger screens bring such substantial benefits to so many personal-computing tasks that as these devices become more capable and we use them for more, we’ll be more willing to carry around a bit more bulk for the benefits that it brings to what we actually care about.