Controllers are there for a reason
Easy to hold, easy to use. No thanks to a screen - the Dreamcast was odd with this.
Twin thumb sticks is the console standard (like PC Mouse and WASD). Only real change is positioning, some are lop sided some are not.
You can pick up most games on most consoles now like this.
Due to my age I find close to distance focusing slower now, so a small controller screen would be a pain. For portables I take off glasses.
However I do prefer motion controls for FPS.
25-3 with 21 kill streak from a middle aged person says motion controllers can work, literally point and shoot, bye bye DS3 owners, this is using the so called joke controller, Move, no joke when you can win matches with it.
The Wii-U controller does look rather big, but what is telling with Wii is that one son when playing Mario Karts plugs in the traditional controller, I struggle to play it, so don't bother at all. I am not bad at racing games, I beat them at Motorstorm!
Mind you none of them have bothered with Mario Karts since we got Modnation Racers.