Why does yasuo have a crit passive?

This is a serious question for riot, Not for the troll yas mains on the board that will answer with stupid stuff like ( "oh he needs crit to be viable ) , ( "yas is not op, without crit, he will be forced to go tank ).

Lets be honest here. whenever someone talks about nerfing yas, no one ever mentions the obvious fact that his real power relays on his passive. For that reason riot has been lowering his base stats ever since to compensate . I say you don't need to do that, just get rid of his passive. I know a lot of people care about champion identity, but there is only so far you can jusitify unbalanced mechanics.

Crits are such a polarizing stat. You have a random chance. a "Random" chance, to do double damage. That by itself makes it hard to balance, but when you have champions that abuse that mechanic, they are oppressive to deal with. . Even the recent rengar despite how bad they gutted the rest of his kit feels oppressive to deal with because of his free crit after he ults.

When champions do get 100% crit chance though, they have some compensation for it however . So they don't do the Flat 200% damage in early game. ( fiora is a different issue all together, so lets not get into that ).

But why does a champion who relies on crits, only needs to build 2items to do 100% more damage than someone who builds the same? . Even people in bronze will find yi less op than yasuo.

I understand that yasuo takes skills to play, so that makes not look as over powered. I get that. But from a design point of view, I would argue that any champion that abuses a core mechanic in the game, will always be over tuned or unbalanced. I'm talking about

• mobility
• vision
• auto attacks
• death cycles.
• tankiness
• health Champions who abuse these things, that are basic features of the game that everyone else relies on, always seems over the top, so riot is forced to nerf there kits into the ground until they become unplayable. This is not me spouting nonsense, we see it with new champions all the time ( kalista is the main offender here ). We all knew having non stop kiting passive would be a bad idea, instead riot decided to nerf everything about her kit that was not the problem, until now she wont even come out into the sunlight. (Probably why her skin so pale).

So my question to riot is, does yasuo really need a crit passive? Is there no other way to design around him, ( like hp buffs, higher Q damage, ult time decrease w/e )? Cause I am all for champions being unique and all, like soraka's healing for example. But at one point do you say, (" maybe her healing is not the most healthy mechanic for the game ")