Tbh the large majority of the community just don't like a mobile assassin. I also agree that yasuo is just fine right now (he should probably get some buffs to like his base stats). But here from what I know people don't like:
Wind wall
His E
Double crit mechanic
And passive shield
Ult that gives armor penetration steroid
Wind wall probably shouldn't block anything WHILE it's being casted
E is fine since it's limited based on minions/enemies
Double crit either needs to be removed and his damage needs to be moved elsewhere or he keeps it
Unless they buff his early laning phase the shield is needed
So to me, the only thing that's needs to be "nerfed" is wind wall. His base stats needs to be buffed to justify the removal of his passive shield, armor pen should be removed and his Ult should just do a lot of damage and his e/crit mechanic is fine.
Another thing is widen the hit box of his tornado to make it easier to hit and disallow him to Ult targets that have been knocked up by allies (neutral minions are fine)
Those are my 2 cents