yasuo can hit 100% crit with just two items.
which give him a very nice power spike. he then does not need to buy any attack speed/crit items or ad/crit items of which there is only one other item and can just stack flat AD. ad items like bloodthirster, death's dance, ravenous hydra tend to have a solid 80 AD and other beneficial effects, whereas items with crit usually compensate with less AD, 70 in both their cases, or none at all because they give attack speed. the average ad carry will buy one to two or maybe even three attack speed items depending on how they scale, missing out on all of that AD, meaning yasuo can get ahead by anywhere from 30-40 ad to over 100 ad than the average ad carry has any hope of building. and that's not including his free armor pen he gets which is stronger than the normal armor pen item. if he gets this he gets even stronger with the synergy but the average ad carry needs to get a giant killer which has a lower ad amount of 50 losing them out on even more of the ad he can stack freely because of his stats.
I don't know what you're arguing, if you're saying yasuo does no damage then you are straight lying to yourself. his damage Is so big it's only gated by his need to close the gap.