You guys bring up a good points about the screen size. More specifically, the usable screen size.
I'm personally excited for the potentials of a function bar, but you two have reasonable concerns about the 8's usable screen being too small. It's a bit unfortunate that Apple is alienating their own user base in a way. If there's only one size iPhone 8, there is no longer a choice for consumers in Apple's top flagship device.
It then makes sense for Apple to keep the 7S and 7S Plus models around another year as "second tier" flagships (though they certainly won't advertise it that way). Maybe in 2018, we'll see two proper iPhone flagship models again that offer a larger screen.
BTW, I really don't think the iPhone 8 will be called "iPhone 8." I'm starting to believe the "Edition" rumor more, because what in the world will Apple call 2018 iPhones if the 8 is already taken? They can't use 8 again. Would it be 8S then? And we'd treat this as a year that Apple sort of released two-generation iPhones? Can get confusing. "iPhone Edition" makes sense, then Apple could release in 2018 an "iPhone 8" and "8 Plus" that has the flagship features of the iPhone Edition.