@meddler the only nerfs yasuo needs (from a yasuo main)
what is giving yasuo TONS of bonus power for mains that use this (and its not hard to use) is
you can Q during your ultimate. so you QQQ which takes like 3 seconds, and then hes knocked up and you use your ultimate, and THEN you can blast out nearly 2 Q's while your enemy is floating in your ultimate
so when your enemy drops back down, literally your tornado is ready after 1 SECOND and you tornado AGAIN for just insane damage
this allowd yasuo to go 2 damage, items, 3 tank items, a bloodthirster and just smoke any 1v1.
so first area i would hit for yasuo is make him unable to Q during his ultimate (while floating)
next nerf. maybe a bit of a nerf to the shield (imo the shield should just go on a 12 second cooldown, and it should not function off flow. seems lame but flows only function as a resource is showing when the shield comes. imo the shields a bit too strong right now, and could use just a 12 second cooldown to be balanced. and with that change flow wont need to exist. and the ultimate gives a free shield when used putting it on 12 second cooldown again)