I want to talk about what we're doing with Yuumi real quick. Couple things right up front:
First: She's significantly overpowered right now in pro play. We do nerf low win rate champions who are overpowered in pro play; usually the thing that eventually lets them off the hook is a successful rework of some scope. We're already working on that.
Second: Our approach to Yuumi over the last 18 months or so hasn't been effective. She's increasingly more of a pro problem over time, with a lower win rate for average players than ever, and players are letting know that she's not in an acceptable state. We agree.
This patch, we're nerfing her with the goal of getting her out of pro play if possible. She's going to be in a rough state for solo queue in the meantime. When it's ready, we'll be shipping an update with the goal of bringing her winrate back up without bringing her back into pro play. At the same time, we'll be aiming to make her more supportive of specifically ADCs, and make her significantly less inclined to ditch her lane partner later in the game. I have no clear timeline for that update particularly after the events of the last week.