Stop comparing a certain champion's skills with winrates
They don't always mean if the champion has a good mechanics or not. You say his winrates are high, but what about his:
- ban rate?
- pick rate?
If either ban rate is pretty high, or pick rate being low while showing that certain champion's winrates are like 46%, it does not show that his mechanics are underpowered. Just people knowing he is OP, so they have to smartly ban him lots.
Hell, even 
is on top of the winrates right now, and people be like asking for nerfs. But NOOOOOOOOO, people who call themselves "diamond" or w/e always says things like "Kill his guns first, then focus him". And when it comes to fighting 
who has 38% ban rate and he needs nerfing to calm his shiet down, but nope, they instead respond back with "He has 47% winrate, he's fine~" or "Buy Zhonyas".
Just....just stop comparing winrates with various champions here. It's not even a smart argument. Just words which you use to defend your main.
to ult instead.