Necessarily 'redesign the modern smartphone' is a different proposition now than it was back then. In fact take a look at all the flagship Android smartphones, they all look pretty much the same, I've just seen the xiaomi mi mix 2 and I think that's a good idea putting the camera and bezel at the bottom, and they have eliminated it at the top, but Samsung, LG and Xiaomi and whoever else all look pretty much the same. This is why what Apple have done while not as groundbreaking, is neverthess in some ways more difficult, because let's face it when you have a flat oblong piece of almost all screen glass, there's not really much room to do anything really innovative but in that very small room, Apple have indeed come out with something that is obviously genuinely different because otherwise there would not be all the tech writers going apoplectic with indignation.
Whereas everyone else's phone's all look the same Apple has gone for style and class as I said in this post
here...
Whereas Apple began with a very stylish phone with stainless steel borders and glass, then everyone has been working for 10 years to what we now have, which is sleek all glass phones without any trimmings, but now that phones have matured Apple have designed a phone that is truly modern yet beautiful in the way that a rolls royce is beautiful, notwithstanding that it's not to everyone's taste.
So that's what I meant, and I think you'll now see that everyone will start to do a u-turn and try to bring some design back to the phones, because just making a solid slab of glass with no distractions at all, is not really very nice, it's more of a 1970's idea of 'modern'.
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One word answer...design. Making something that is beautiful to look at, yet modern at the same time. Phones will become more like jewellery rather than soulless black slabs of glass. This is why Samsung's direction which was to take the glass right to the edge and then down, is going in the precise opposite direction. Where to they go from there? Whereas Apple have made a basically bezel less phone, but it has a very deliberate border, and they will play with this this further I'm certain. Glass to the edge is dead, from 2017 on.