The PC space used to have more experimental designs, but I guess we are past the day of people being willing to configure a controller to play a game because there's basically no software made for flight sticks these days that isn't a sim.
Personally, I find the diamond configuration of 4 face buttons strictly worse than what the GameCube had, but there's room for improvement there too. For example, even though the "satellite" design was great it could be easier to hit A+B, A+X, and A+Y simultaneously.

I wouldn't mind seeing some more commitment to expecting people to use different fingers for L2/R2. The current grip for that sucks on every mainstream controller and the buttons should be further apart.
These are dumb button symbols: "+", "-". I'd rather have buttons with Roman numerals or whatever because then there wouldn't be the temptation to make the button the shape of the symbol.
I would also remove the click function from thumbsticks since it is routinely used in awful ways.
In terms of 'new' ideas, what about a hand grip that can be squeezed? Could be fun for a few gimmick actions, but might also be a good replacement for thumbstick clicks.



