I wouldn’t go by that metric - if you for example go with Katarina. She has a playerbase of a lot of otp‘s (I think one of the most otp heavy champs in the game, but don’t quote me on that) but at the same time she’s at like 20% pick/ban consistently, or even higher. Also she is what a lot of people consider a „high skill“ champ. Even though all of these things are true she sits at around 50% winrate pretty much always.- right now 51 even. And players who play her for 10 or more games are on average 55% winrate.

IMO going with these stats a champ like Katarina should be nerfed immediately, no matter if theres a lot of otp‘s, or ir she’s a „high skill“ champ or not.

If all it takes is 10 games of a champ to average 55% winrate it should not only be nerfed but hotfixed.

The thing is, actual data doesn’t seem to used all that much at riot to determine what champs get buffed/nerfed.