I've seen some forums (mostly political) where you have to prove that you can act like a child to be welcome. So that's kind of like what you're talking about?
(If anyone is offended by this, don't worry, I'm talking about the other side; I'm sure your side is full of reasonable adults who just get a little carried away sometimes.)
The main advantage of physical buttons compared to touch screens: you can't put ads in them. I immediately imagine a situation in a new car where the steering wheel has been replaced with a screen[1] and right as you drive, "you can regain control after watching this short five-second commercial".
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