Yasuo isn't op
I just can't trust my top lane/jg to not feed him and then deal with a fed yasuo that can nullify 99% of my kit through unlimited dashes and/or a windwall that deletes everything that touches it with no downsides (a cd isn't a downside since every ability has that - except his Q, E and R ofc).
Fuck this champion, I can't even ban my lane counters or strong meta picks because this champion exists and I have to ban it because god damn well knows that if I don't my yasuo will feed into eternity and the enemy yasuo will be 25-0 5 minutes in (slight exaggeration).
just gives him a tad too much movement speed. Most of his abilities can be countered by just walking away.
The problem comes when that isn't an option. Then you suddenly need teamwork. Hence why high elo doesn't care much about Yasuo one way or the other.