Ironically, Yasuos only weakness is...
Yasuos only weakness is the fact that he has no weakness. It gives the player a false sense of godliness that baits them into repeatedly 1v5ing. Fortunately enough for the Yasuo player, Yasuo is so broken, that this type of suicidal, bronze behavior,actually wins games in the end. Even if he goes 0-10 in the first 20mins. Because the balance team knows what theyre doing.

and he could pretty much build whatever he wants from there.
and
would make him more bruiser material, but his build paths are incredibly flexible
and that's only because it's one of the lowest AD items when he prefers higher numbers because Crit is the easiest for him to build off of
, your spellblade auto attacks will apply the damage from 