Riot is looking into Yasuo nerfs

6.18 Base attack speed increased to 0.67 from 0.658. Attack speed growth reduced to 2.5% from 3.2%. Last Breath: Bonus armor penetration now only applies to Yasuo's critical strikes.

The attack speed change was a buff. The whole community erroneously perceived it as a nerf to tank Yasuo, but the difference was meaningless as it only takes 9.134% AS to exceed previous levels. Since every Yasuo build has AS from runes anyways, this meant that they only experienced an increase in attack speed at all stages of the game, especially given that tank Yasuo already built PD in the first place. It is not wholly unsurprising for Yasuo to have at least finished Zeal or PD by the time he hits Lv 6, so access to the bonus armor penetration only went down from 100 to 60 or 40%, not 0%. Given that he deals damage anyways in those cases where he doesn't land the crit, and that most champions he encounters rarely build more than 60 or so armor by Lv 6 (If they build any at all), the difference in damage output actually isn't all that different from before. Yasuo still proceeded to build some tank, and to this day builds Frozen Mallet in at least 20% of games.

5.8 Way of the Wanderer: Flow capacity increased to 「 100 – 510 」 from 「 60 – 470 」. Flow generation reduced at early ranks to per 59 / 52 / 46 units traveled from 46 at all levels.

Buffed by approximately 30% in the early game, and 9% in the late. "Working for it" was meaningless here, it was purely a buff.

4.21 Movement speed increased to 345 from 340. Steel Tempest: Cooldown reduced to 4 seconds from 5 / 4.75 / 4.5 / 4.25 / 4 seconds at all ranks. 4.18 Base health lowered to 462 from 512. Base movement speed lowered to 340 from 350.

Got nerfed, then very soon buffed.

PD is a dumb item and i wouldn't be upset about it being reworked again. % damage reduction is absurd as an item meant for squishy duelists

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Except Lee has been actively in and out of proplay for whole seasons. Yasuo, maybe only S5/4?

Pros tend to play champions with high skill ceilings and/or good team fight capability. Lee Sin fits those categories hence why he's seen consistently in pro play. Yasou requires team comps built around him so it's harder for him to be a consistent competitive pick.

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Except Lee has been actively in and out of proplay for whole seasons. Yasuo, maybe only S5/4?

Yasuo fell out of meta for most of season 5 He did make a comeback in season 6 with cancerous bruiser builds due to his abuse of prenerf Fervor