I suspect the problem isn't just the physical size of the screen, but how does the UX fit it. iPhone apps were always designed with a very specific screen in mi

I suspect the problem isn't just the physical size of the screen, but how does the UX fit it. iPhone apps were always designed with a very specific screen in mind (consider the back in the top right, for example). Apple is facing a problem: they can not increase the screen size without breaking lots of apps, or breaking the current UX paradigms they drilled into users' muscle memory in the last 5+ years. What wonders me is that they should have known better: we had the same issues 10+ years ago, with computer screens increasing in size and DPI.