Capcom patches their games, just not on a balance-tweak overload that MK does. They fix it so that shit isn't broken (or at least in their minds), and that everything works as intended.
Then, months later, they decide to pretty much rework the game as far as a "what worked and what didn't work, what should we try to improve" standpoint.
Your "fair comparison" assumes that pretty much the system of how things work is exactly the same as the previous version, and the only thing that changed was pretty new characters. And that's not true of what capcom is doing, let alone "fair".