I think the items that make Tank Yasuo should be nerfed, since they are very recently buffed or reworked items like

The only nerf Yas needs is his Q damage, the overall damage should be nerfed, and traded for scaling damage for late game to prevent his static shiv or phantom dancer power spike from coming so early.
His windwall has such a high CD even at max level, i don't see any issues with it, it's like his passive, one single auto attack will make it go away, all you have to do is play smart and realize what is in his kit just like any other champ.
When i go against Malz i know his passive is a stolen Yas passive that got improved to where it blocks 100% of the damage and even 100% of the cc, i don't think his passive needs to be nerfed, i just realize i need to take away his passive first.
Same thing with Yas, you know he has his passive and windwall, get rid of his passive, wait for him to windwall, then make your move when hes vulnerable.
This is coming from a Yas main, it's not his windwall or passive that's the issue, it's the items and his Q damage that make him a problem. And iv'e only recently myself even broken down to the shitty meta of building him like a tank... Thanks Riot...
So in short, his Q base damage needs to be traded for late game scaling, and the tank items need to be tuned as Yas is not the only champ who becomes OP using them.