>>45459963There's been a bunch of arguments on smogon about that sort of thing.
Basically the main issue is how they should decide on what's OU or not.
You'd think "why not just use usage" but old gens don't have a high elo playerbase large enough to support that.
They could just handpick what should drop but then that could result in bias and arguments about OU not being usage based anymore blablabla.
Then there's people that wanna use tournament stats but again the sample size is just too small, and especially in tournaments could be heavily influenced by players bringing shitmons to flex on opponents.