About the balance thing: Nerfing/buffing moves is inevitable if we want a balanced game and IMHO if you let a OP move carry on too much, people who use the character with the OP move will start complaining when it gets nerfed *remembers B+ 5.0 Ness players*.
I think the ONLY thing that should NOT change is the moveset, lets say you leave Ganondorf's brawl dark dive in, and then decide to change it back to melee's dark dive, that would certainly cause a problem to players. Other changes like Ganondorf's Dthrow in B+, was a dumb thing to do, sure you can change the angle, but not make an entirely different move than we are used to.
But I do think that balance should be made gradually, and sure, you can attend glitches/stupidly breaking stuff fast(like B+ near gold D3 and Samus) and just release other balance issues every month. Sorry I used B+ so much but it was the mod that almost all of us know and the easiest way I got to explain my points.