PSA: Despite Yasuo's 20% Bonus AD "Compensation", the change to his E is still a flat-out nerf.
To everyone who's been saying "God forbid Yasuo gets a nerf without getting a buff to compensate," look at it this way before you go complaining that Riot is giving Riot special treatment instead.
Obviously the base damage reductions mean that this skill is weaker earlygame, but the 20% Bonus AD scaling doesn't give Yasuo any extra strength late game. In fact, unless Yasuo builds a significant amount of AD more than he should his E will still be doing less damage than it currently does.
Here's why.
At max rank, Yasuo's E deals 50 less damage than it currently does. In order to cover that deficit, Yasuo would need to build 250 Bonus AD. Additionally, the Bonus AD scaling doesn't benefit from the damage increase for subsequent casts of E, meaning not only does he need 250 Bonus AD to return his E to its normal damage, but that only normalizes the damage for E's first cast.
If Yasuo uses 3 E's within 5 seconds of each other right now, it would deal 150 damage, then 187.5 and 225 on the subsequent casts. Now, if Yasuo is using a build that grants him 250 Bonus AD to return the first cast's damage to 150, then the subsequent casts would only deal 175 and 200, which means that his E is still weaker even with the AD scaling.
Now, looking at a standard Yasuo build:
Notice that only 3 of these items give Yasuo Bonus AD.
This only adds up to 175 Bonus AD.
The numbers:
Instead of dealing 150, 187.5, 225 damage like it currently does, it would do 135, 160, 185.
(If you want include 10 Bonus AD from Runes that Yas might take over AS, just add 2.)
Unless Yasuo players started doing whacky AD-heavy builds like building 
instead of and 
instead of , you can rest assured that, even with the Bonus AD scaling, Yasuo will not be any more damaging late game than he already was/is.
TL;DR: These nerfs are a hard hit to early game E maxing, and still translate to less E damage late game unless Yasuo builds a ridiculous amount of Bonus AD to compensate.
's e should do no damage, only used for mobility. His damage from his crit autos, q, and ult is enough. Hell, he already has a damage buffer after using his ult.
(first part of his E is technically a dash and does no damage, second part is a blink that does damage) 
's R is technically a dash without damage, but then it creates a zone with bonus on-hit damage. Should we consider that as damaging dash? I don't really think so.
(W) 
(E) 
(Q, but does bonus damage on next auto) 
(Q, but does bonus damage on next auto)
