disbenefit:

mario shows no motivation.  mario is a reflection of his environment, oftentimes literally.  mario has no stakes in his adventures and no real reason to be there at all other than the fact that its what he does

luigi has clear personality differentiating him from his blank slate brother.  luigi has purpose in his adventures, luigi has flaws where mario has none, bringing him to 3 dimensions more than any graphical engine can do for his brother

wario has more motivation than all characters in their universe.  wario is simple but driven.  his personality is finely crafted to the point that any gameplay mechanic that forces him out of character feels unnatural.

waluigi does not allow himself to be the pawn of circumstance.  waluigi serves no master but his own whim.  waluigi doesn’t want to go-cart this game?  waluigi won’t go-cart this game.

donkey kong loves bananas