It reall sounds like iPhone 8 will have a massive bottom chin if only 5.1 inches of the screen are usable, it will look very odd and disjointed in my opinion with a large row of bottom buttons.
I agree massively. I do not get why the "bottom buttons" have to be so large. 0.65 inches of phone lost just from them, that is a lot of screen space if you really think about it. How is that a step forward? Going from 5.5 inches of useable space, down to 5.15 inches, makes no sense to me.
Hopefully they will somehow make that space at the bottom usable too when the virtual buttons are not in use. I mean the virtual buttons on my Android device do disappear on some apps and I get on with that.