I personally don't think that he needs a nerf whatsoever to his laning phase because, if I remember correctly, the last time Riot gave him a couple of nerfs here and there, it was mainly to sort of make him a less of a threat mid-to-late game I believe or just late-game in general and what they did was, they reduced some of his Attack Speed per level but, they either kept his base Attack Speed the same or just increased it a bit. I can't remember the exact details but I know that, these nerfs happened around the time when Tank Yasuo was a big issue.
Regarding his dash needing a higher CDR, I think that would be nice. His dash already has a fairly high CD for whenever you dash to a particular minion and it would be nice to be able to dash back on the same exact minion a bit quicker because currently, you have to wait what, 20 seconds at best just to dash back on the same minion? Like, that's not what Yasuo was designed for, in my opinion at least. You know, one of Yasuo's biggest strengths is having really good mobility when there are creeps around and that's what he needs to have. If you don't have any creeps around you, you're going to be in a very vulnerable position, to the point where you can easily get collapsed, easily get CC'ed on and that's just what prevents a Yasuo from performing really well for their team.
In terms of his windwall, I see no issue with it other than the fact that, for ranged sort of champions it can be somewhat difficult to play around, simply because if you're wanting to proc an enemy Yasuo's shield, you're not able to because of his windwall being up and your auto attack being ranged, if you're trying to throw out a snare, a slow, whatever, you're still not able to at times because of his windwall being a counter to that. But that's just it you see, a lot of champions within the whole of League of Legends needs that one particular defensive ability to be able to do simple things like sustaining in the laning phase, helping in teamfights, contesting Baron attempts etc etc.
For his passive shield, I don't exactly know how much damage his shield can protect him from but I just know that, it is pretty helpful for Yasuo players out there to be able to have that shield up for whenever they need to it because, let's say for example, you're playing Yasuo, you have a Baron buff on you and you need to back asap because you're at like 400 or so health and someone's trying to kill you already, that passive shield is really going to help because even when it procs the minute someone hits you, you won't die or anything because the shield will actually absorb some of the damage. Being in a clutch situation with something like your W being on a fairly high CD, your only other alternative of surviving would be your passive shield. I mean you could just dash away but that's only if you have creeps around you and you can't flash away if you've only just used it 30 seconds ago.
In addition, wanting Yasuo to use mana so that he can't spam his abilities so often without cost is like saying, Camille should NOT use mana whatsoever so that she can be way more busted than she already is right now on the PBE. That's how ridiculously absurd that sounds in my opinion. Yasuo's a fighter. He's all about high. damage. output along with high. mobility. How do you expect a Yasuo to be able to deal high amounts of damage while still being able to be really really mobile at the same time? Would you want to see new and completely crazy build trending for Yasuo players across the world? Like, we're talking, Moby boots, Aether Wisp, Ardent Censor, Youmuu's etc.
Last but not least, I wanna comment on one more thing. Yasuo's dash is only somewhat cancer when you don't have a team comp that can provide a lot of hard CC. An ideal, simple team comp to have that can prevent an enemy Yasuo from becoming such a threat in a game would be; Darius top, Amumu jungle, Annie mid, Caitlyn adc and Alistar support. With that sort of team comp, not only would it be able to provide a really good amount of hard CC but it would also mean there would be some good catch potential, some good zoning potential. Yknow, with a Darius and an Amumu in the middle of a fight, if an enemy team wasn't smart, they would be focusing those two in particular. Then you'd have the Alistar knock up followed up with the Caitlyn and Annie sitting on the backline, completely destroying the enemy Yasuo. Yknow, with that kind of team comp, a lot can be achieved if your team know what they're doing. And as for his windwall being used in teamfights, dude, that would be irrelevant if you and your team just simply collapse on him/focus him first with decent amounts of CC and just ensure he has no access whatsoever to creeps. That way you can just easily kill him and take it from there really.
In conclusion, I believe I've stated enough to say that Yasuo definitely doesn't need nerfs lmao. The last couple of nerfs that he received were enough and I think he's perfectly stable in the current meta. To be crucially honest, I think the main reason why most people even nowadays think that Yasuo needs whatever nerf is because of the fact that they really don't know how to play around or against an enemy Yasuo and I think that, that's just something they personally need to work on because, if they can work on that soon enough, a couple of months down the line they'll look back and think about the times where they felt Yasuo needed a nerf or two lmao. But that's just all I had to say really.
was coming out.
and Statikk Shiv, then go practically 1v5. considering the fact that Yasuo is the easiest champion to get pentas with, i'd say he needs nerfed. Like at least disable the I.E. 
