It is necessary to balance around proplay.
The reason being is that whatever the pro´s play is whatever is the most effective and likely OP compared to the rest when played well, even if the casual Joe cant make sense of how to make it work for the life of him
.
This because casual Joe is not the only player out there, there is also dedicated and studious Sam who is doing his best to learn and improve, he´s watched the pro´s and learned how to do what they do when it comes to playing the champ even if his macro is way worse.
Will Sam have the same winrate as Joe? No his winrate will be much much higher, and given how large the player base we have quite a bunch of people who could be put in categories based on Joe and Sam here.
So what happens when a bunch of Sam´s start running around with super high winrates on average because their champ lacks counterplay and weaknesses when mastered?
All the Joe´s and other people out there will be pissed as hell, they might have spent tons of time mastering their own champs but because Sam´s champ is better he gets to win more.
.........
We saw this happen with Aurelion, we saw it happen with Urgot,we saw it happen with Irelia and we saw it happen with Malzahar for a few examples.
Maybe it´s time to realize that even if the casual players cant make the champs work to their full potential its still very much justified to nerf them when they are much too powerful when someone actually starts maining them?
For instance a Rioteer shared that when someone plays Irelia toplane and learns her matchups well enough, which took like 50 games or something, then their winrates will suddenly jump to 52% on average.
When they get better on her those winrates rise again, this time to 56% or even higher although after those last rounds of nerfs the majority of mains at that point sat on like 54% or something.
Is it justifed to nerf a champ with that high winrate? I´d vote yes anytime...