LancerStaff
Smash Hero
Because FFAs sell the game. 1v1s don't. Who's moronic enough to balance the game around what amounts to a side mode at best?...Why? How could that possibly be a bad thing? In a smash 4 with better balance, people have a comparable amount of options, or at least in the absence of options, they have balancing strengths. Having 3 or 4 people fighting each other wouldn't change this. It's not like team mechanics would get any more ridiculous than they are now. In 2v2s, the moment the match becomes a 2v1, the lone person to get grabbed basically loses.
Sakurai doesn't do very well when it comes to making competitive balancing decisions, lets be honest, he never has. I figured this is what Namco was supposed to be for (since they probably have the best track record for balancing huge fighting games), but apparently not.
Samus is a good example. She's basically Charge Shot the character. Give her real options to defend herself and now she's the absolute best character in FFAs. Take away the current Charge Shot and buff her other moves a bit more and now she's balanced... But now she's boring to play because she's a nothing-special no gimmick character. That doesn't fly in Smash. Which is why she's Charge Shot the character.