Platformers and *pure*
platformers were around before they even designed a joystick that had two or more independent buttons or even a gamepad. Who really cares whether you need to push the joystick up to jump etc, it's all in the game play and it adds that uniqueness to the real platform games.
Having a gamepad that has a button that does everything conceivable, IMHO, is just pointless and boring, but having to use a one buttoned joystick and having to work things out to actually achieve something in the platformer uses the ingeniousness of the person.
Take another look at the Amiga platformers, I think you'll find they were the best, of the best, of the best my friend