For those who care to know...
http://nate-whs-2015.weebly.com/uploads/3/8/6/7/38673665/2643676_orig.jpg
Here is a list of every Patch Note Yasuo has been part of...
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3.15 Added.
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4.1 ##Way of the Wanderer (Passive Bug Fix) The 10% damage penalty now applies to Statikk Shiv ##Steel Tempest (Q Bug Fix) Third cast is now automatically smart cast (as with the first and second cast). Improved reliability of the Sweeping Blade combo. ##Wind Wall (W Bug Fix) No longer blocks friendly Dark Spheres. ##Last Breath (R Buff/Bugfix) Now grants maximum Flow on cast. Spell animation shortened by 0.1 seconds. Now less likely to follow targets using Flash. The cooldown is now appropriately tracked for the purposes of spectator mode and the interface.
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4.2 ##Resource Nerf Flow generation reduced to 1% per 46 units from 1% per 40 units. ##Steel Tempest (Q QoL) Now displays a maximum range indicator while the third cast is available. ##Wind Wall (W Nerf) Bonus flow generated on Sweeping Strike reduced to 3 / 6 / 9 / 12 / 15% from 4 / 8 / 12 / 16 / 20%. ##Last Breath (R Nerf) Range reduced to 1200 from 1300.
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4.3 ##Way of the Wanderer (Passive Nerf) Shield duration reduced to 1.5 seconds from 2. Shield strength reduced to [60 – 470] from [60 – 690].
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4.5 ##Stat Buff Base armor increased to 19 from 15.
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4.11 ##Sweeping Blade (E Nerf) Bonus damage cap reduced to 50% at 2 stacks from 100% at 4 stacks.
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4.12 ##Sweeping Blade (E Bugfix) Fixed a bug where the ability sometimes didn't count as a spellcast.
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4.13 ##Way of the Wanderer (Passive Nerf) Shield duration reduced to 1 second from 1.5. ##Steel Tempest (Q Nerf & Bugfix) Cooldown reduction from attack speed reduced. Minimum cast time increased to 0.18 seconds from 0.13. Attack speed needed to achieve minimum cast time unchanged (+114%, or +60% from items at level 18). Fixed a bug where Steel Tempest's whirlwind was dealing instant damage in the area of a normal Steel Tempest cast as it was traveling out. ##Wind Wall (W Passive Removed) No longer passively grants bonus Flow from dashing.
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4.17 ##Steel Tempest (Q Nerf/Bugfix) Fixed a bug where Steel Tempest was put on a shorter cooldown if cast in conjunction with Sweeping Blade.png Sweeping Blade.
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4.18 ##Stats Nerf Base health lowered to 462 from 512. Base movement speed lowered to 340 from 350.
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4.21 ##Stats Buff Movement speed increased to 345 from 340. ##Steel Tempest (Q Buff) Cooldown reduced to 4 seconds from 5 / 4.75 / 4.5 / 4.25 / 4 seconds at all ranks.
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5.8 ##Way of the Wanderer (Passive Buff) 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.
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5.14 ##Steel Tempest (Q Bugfix/Buff) Fixed a bug where the third cast wasn't applying on-hit effects.
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6.1 ##Wind Wall (W Bugfix/Buff) Fixed a bug where certain targeted abilities (such as Twisted Fate's Pick A Card.png Pick A Card) would pass through Wind Wall as it spawned.
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6.14 ##Bugfixes Fixed a bug where Yasuo could be locked out of his basic attack after casting Sweeping Blade.png Sweeping Blade or Last Breath.png Last Breath. Fixed a bug where Steel Tempest wasn't always critically striking when Yasuo had 100% crit chance. Wind Wall no longer fails to block projectiles in the instant it was cast, if cast at the same time Yasuo died. Fixed a bug where Sweeping Blade could be chain-cast on multiple targets without cooldown or cast time if cast while knocked up.
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6.16 ##Sweeping Blade (E Bugfix) Grasp of the Undying's cooldown no longer refreshes when Yasuo attempts (and fails) to cast Sweeping Blade on a target he recently dashed through.
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6.17 ##Last Breath (R Bugfix) Fixed a bug where Yasuo's first basic attack after Last Breath was delayed if it was a critical strike.
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6.18 ##Stat changes Base attack speed increased to 0.67 from 0.658. Attack speed growth reduced to 2.5% from 3.2%. ##Last Breath (R Nerf) Bonus armor penetration now only applies to Yasuo's critical strikes. Fixed a bug that allowed Yasuo to get an extra basic attack when casting Last Breath.
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6.21 ##Steel Tempest (Q QoL) Fixed pixelation on the max range indicator of PROJECT: Yasuo's third Steel Tempest cast.
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6.22 ##Visual QoL BUG FIX: PROJECT: Yasuo's basic attack animations have been adjusted to visually slash the target at the same time damage is applied, rather than slightly after.
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6.24 ##Last Breath (R Bugfix) Launching yourself or an ally into the air via Blast Cone no longer counts as an enemy displacement effect for the purposes of an active enemy Last Breath airborne check. In other words, you'll pass through Last Breath rather than getting stuck in it.
For those not keeping track, he has had 15 Bugfixes, 6 Buffs, and 11 nerfs along with his W passive being removed. (It used to grant extra Flow by using E.)
Just letting you all know that he has indeed had nerfs. Apologies in advance in case there are errors here, I got hit with a nasty cold.