I don't think that's the biggest part of the issue, though. I think it's that whatever functionality is there has to work across a broad range of devices. Someo

I don't think that's the biggest part of the issue, though. I think it's that whatever functionality is there has to work across a broad range of devices. Someone mentioned consistency and that's what's key here that I think most people are missing. Using an iPad is, generally, the same experience as using an iPhone even though an iPad has a completely different set of utility than an iPhone. That means that the fact that phone screens have gotten larger is irrelevant because whatever complications or features are added have to work broadly and consistently amongst devices of varying screen sizes. Web developers actually have it down best when it comes to responsive design but even responsive design makes for a different experience on mobile vs. desktop and I think Apple is trying to avoid that. An iPhone might be "hard to use" for someone that's not tech savvy but, once they learn how to use it, they now have an easier time across Apple's entire product line, not just that one device.