The Next Gen Watercooler

Yes,I’m looking at you Super Smash Brother Brawl.
I’m fairly new to the Wii world myself,so I decided to try it out.The game is fun,but it wasn’t designed with the Wii controller in mind. It looks like the ideal controller would be the Gamecube.
My question is why? No new games that are released on the Wii should be using a older controller as the main way to play.You can use the Wii controller,but it’s just awkward.People buy Wii games to use Wii controls and it’s just not prevalent in Super Smash Bros. Great Game with a poor control setup.