Yasuo's output potential isn't really justified by his high input rate
I mean i get that you have to do a lot of button pressing, and it's on you to not make a mistake when playing him, else you get punished. After all, most champions aren't really capable of forcing a favorable trade on yasuo unless he does make a mistake, so they're just waiting around until he does make one.
Yet, that really doesn't justify why the champion is given such high power and impact in the game. (Impact, you know that term which is really just a sugar coated way to say "overloaded") If the champion was fun to play, he could have little impact and you'd still see people playing him because he had a fun kit. As it stands, giving him so much power simply makes him unnecessarily attractive to try hards that want to play something that's over powered (in the sense of above average power) for the sake of it being powerful.
There are much better champions for this label to be on, and generally in the past it's determined by popularity, say a streamer gets popular playing the champion or it's used as a niche pick in the LCS. Yet the blatant power advantage for cost that the yasuo gets is just poor game design.
He is by no means the only champion who falls into this description either, lucian, lee sin, thresh, the list goes on. There is just really no reason to make these champions so blatantly powerful compared to the rest of the positions or roles they fill.