I still don't see what I'm saying that you find so objectionable.
The success of SB has never hinged on balance. More content (characters, moves, stages, items) is going to serve far more players than balance would, since the perceived balance issues seem to matter most to competitive players, who try to rebalance the game based on their own ruleset and probably would continue to anyway, regardless of how much Nintendo did to balance the game. Making low level play better, with more content, is going to improve the game for more people than focusing on high level play would. Nintendo should focus their effort on the low level players, not the high level ones (since there are so few, relatively speaking). I'd be fine with better balance, too.