q has the best kara throw in the game, tied with chun. it is crucial, especially in a defensive capacity, because it forces people to keep their close range game clean or risk being cornered. maybe you’re right about the combos, but most characters don’t need complicated combos. i can’t use charge characters on a pad for beans, but some people can.
that tth video is questionable. is that the arcade version? the arcade version actually doesn’t have any software-level restriction on opposite directions being inputted simultaneously, which is why it’s possible to walk forward for as long as you want then immediately do a tackle with urien. also, even if that wasn’t true, it’s easier to do tth on a keyboard or hitbox than on a stick for obvious mechanical reasons (zero deadzone between opposite directions). if the video is just illustrating these two points, then it’s not that meaningful for your case.
with that said, i do believe that a well-made hitbox can be very good. but first people need to understand that a stick is just a metal bar that presses on internally mounted switches. a hitbox is basically the same but with the switches mounted on the surface so you have direct access to them. its terribly unintuitive, but with enough practice, i think it can be just as good as a stick, and in certain cases, measurably superior.