At what point does Riot consider a champion "too weak" or "too strong"
43.97% winrate
42.73% winrate
According to Riot apparently both are perfectly fine.
and
both sat around 35% winrates after the former being nerfed to shit and the latter being gutted in multiple aspects. It took almost a month for Riot to do anything about that.
Urgot was trash tier for longer than I can remember (>1 year) and barely got a tiny shield buff when he finally got something. And he was sitting around a 40% winrate IIRC.
Especially when you consider certain champion's roles it is pretty ridiculous how they are still considered garbage. For example, Elise has %max and %missing hp damage, both are great against tanks, but she is still trash tier in a tank filled meta.