User blog comment:Plazmalord117/Lets Talk Yasuo/@comment-6271162-20140310103837/@comment-5331854-20140310144158

That's right, because Yasuo has double the use for every single thing offered by Shiv. Including the passive.

Crit is doubled on Yasuo, which is insane even with lowered Crit Damage.

AS is not only for AAs, but also for his only ability where reducing the time between casts makes sense (since W is a defensive tool on an assassing, which should be used only once per fight, and R is on a low CD anyway), meaning it doubles as meaningful pseudo-CDR.

Movement Speed makes Yasuo regenerate his flow faster.

Since Q counts as a basic attack, Yasuo can recharge the passive of Shiv very fast especially in lategame, since he essentially has two AAs for the price of one.

Everything Shiv offers is essentially doubled for Yasuo, making it the MOST COST-EFFICIENT ITEM EVER for him.

It's like paying 2500G to get 4666G in stats (which is double the Total Gold Value for Shiv on this wiki). Or, in other words, 186.6% of the cost. MS and passive not included as usual.

I know that only Crit is really literally doubled for him, but still, think about it: He still has a meaningful secondary usage for AS and MS... and can reuse the passive faster in fights than anyone else.