One thing I think people don't understand when they say "where's the final smashes/items/wacky F-Zero car stages?" about other platform fighters is that there point-blank is not a market for a game like that which isn't Smash itself - Smash is so all-encompasing and huge at this point that no casual game could provide anything Smash doesn't to a casual audience other than "hey look its mickey mouse hehe". Taking the Melee approach is more profitable because you're targeting the audience most disappointed by Namco-era Smash and therefore most likely to be interested in - and invest in - an alternative.