Unpopular opinion here..
I don't think Lee Sin is OP or broken right now.
He has a 48% winrate across all ranks, and 49% win rate plat plus. This is ok for a decently hard champion.
However, I think Lee Sin's winrate is actually inflated. Why? Because Lee Sin is one of the most studied and experimented on champs in League. Being able to Insec was only possible in high elo in 2013 or 14, but it's not hard to find Gold Lee Sin mains who can Insec these days. The champion has been so studied that what was once a hard champion is not nearly as difficult.
I just don't see any stats that show he's cancer or broken. I didn't hear people complain about him earlier this year, and he's held a consistent winrate since the beginning of 2019 between 48-50 percent.
Please explain what makes him so broken, I don't see it. Nobody had this issue (with Lee) before. The only buffs he has received the whole season has been a 25 point increase in R damage and 5 more damage on Q. Nobody said anything about him before, so why do I see so many posts now saying "Lee OP"? There's 0 data to support that idea.