The iphone was also the first major phone to consist exclusively of a touch screen. Prior to that, other phones had hardware buttons to lock and unlock.
The touchscreen wasn't a novel idea anyway. No phone manufacturer ever thought of making a touchscreen based hand-held device prior to Apple as it was believed (and very correctly too) that it was inherently difficult to operate a 3.5" touch display. It was the app store that outweighed the negatives of iPhone touchscreen , and remember that Apple was already riding on the success of iPod at the time iPhone was released. iPhone clicked and other phone-makers simply followed suit; but that does not mean that touchscreens are more convenient than keypads.
It's laughable that nerds who spend countless hours installing Linux distros and tweaking and compiling software are overwhelmed by the few steps it takes to virtually eliminate the Metro interface.
If I have paid for it, it should work for me out of the box; the way I want it to. Linux is free, so I don't mind spending hours to tweak it.