Note that any amount of damage, any KIND of damage, applied in anyway breaks it. Sun Fire Cape, Tiamat, auto attacks, DFG and etc. all break it. Useless if enemies have a brain unless you intentionally zone yourself out of the minions to preserve it.
But you aren't getting those items early, where it's most significant.
His dashes in general would be absolute shit if it were gated by charges, energy, or any resource due to how small it is. Yasuo using his dashes to its full extent straight through a wave is equal to the distance of one and a half of an Ahri Ult, which Yasuo's E isstill only at it's potential near minions or in laning phase. Sure yeah EQ from Yasuo is annoying and it is probably the only viable thing you even bring up, but at the same time it completely nullifies his potential to 2 man ultimate when being ganked unless your JG sticks to you like glue.
Yep, and the E dashing is a fixed part of his kit that's toxic. You can't "nerf" it without gutting him, but leaving it as is still creates toxic gameplay.
It's bad to use one game as an example, but
A yasuo with this kind of setup should never be able to win lane against anything
Wind Wall being instant cast is literally insanely vital to it's viability because if it even have a 0.5 second cast time, it would be near useless unless, as I say again, you are a "prediction god" and manage to predict a projectile that has no cast time compared to 0.5 cast time, which is a huge difference when adding in the variables of reaction time and reflexes. And the idiots that literally send all their projectile ults/abilities straight into Yasuo's face seriously need to know what a Wind Wall does in the first place.
Again, you can't nerf the ability without gutting Yas, but leaving it as is still creates an unhealthy game mechanic.
There is little you can do to Yas without gutting him, but leaving him unchanged still leaves a toxic champ to play against