@Riot Vayne's Buff from a Vayne Main
I feel a buff is needed but there's so many ways to go about it and more ways to benefit other ADCs as well as Vayne. However, buffing/nerfing champions individually to the game is more of a finetune as well so I see why.
I also don't mind the buff but there are better ways to buff Vayne from a "fun" standpoint because I understand how pissed people get when they play Vayne. I can't empathize though since Vayne seems pretty easy to me to face but with things like Akali or Rengar - oh man. Now, let's get why this buff is pretty excessive.
While it offers mechanical advantages and Vayne maxes W now, you could have just gave Vayne her Attack Speed grwoth and AD on her Ult back that you removed on Patch 8.1. Since sustain has been nerfed as well, Vayne will do better and remain the same with the same stealth she has now, have a better early/mid, but won't be a monster throughout the game or scale too fast due to Patch 8.11 and sustain nerfs (ignite buffs etc.).
It's simpler to me than making her tumble's CD get cut in half. You make both parties happy - but I'm pretty sure people would still complain at any point if Vayne got a buff.
Thoughts from community?
that means they will change anyone who they decide, she's bound to get reworked sooner or later.

I despise Vayne. If I could, I would ban her every game but I have to ban my lane counters.
, there isn't any way I can position to avoid her dmg. if she gets close enough to auto me, I die. I have to pray my assassin (if I even have one) can burst her down before she bursts me down.
when it comes to fighting Vayne.