no wii fit has not been done before.
by your definition all games are the same. Wether you are stepping on a button or pushing one with your finger it does something in game. I can play a game with my feet on a controller if i want.
can you do the hoolahoop game, or the soccer heading game on any other dance pad. no you can't.
wiisports i don't know, i think there are probably arcades that simulate swinging bats or what not. but still nice to bring it fully to a home console, and not as just an add on







