You could, but you'd be missing the point. It's the same criticism that was leveled by some at Sleeping Dogs (a very different type of game, mind you). Sure, you could get through the game just mashing X (and Y to counter occasionally) and win the fights, but it's way more fun to pull off impressive looking combos utilizing all the different buttons. By the same token, you could win most fights in Bayonetta just mashing one or two buttons, on the easier difficulty levels, at least, but the whole point of these Devil May Cry types of brawlers is to pull off various cool looking combos to defeat your enemies as stylishly as possible. Bayonetta has a very robust combo system utilizing most of the buttons on a gamepad.