Yuumi has simultaneously been one of the most frustrating and most popular/played champs in the game. We think there’s a better place for Yuumi where we can deliver on her gameplay fantasy for her players while also making her less frustrating to play against. In this patch, we’re giving Yuumi a decently sized nerf to temporarily address some of her more frustrating features and curbing her power in both Elite and Pro play. However, we definitely don’t see this as the final, long-term solution for this champion.
We’ve started work on a larger scale Yuumi rework to help this cat land in a much healthier spot. We want to highlight what Yuumi as an attached, untargetable enchanter can provide to her team. As an early goal, we want to limit her aggressive CC outputs/damage, emphasize more defensive/enchanter outputs, reduce her scaling, and make her more dependent on her own lane's success to win games. We’ll have some more news to share on this in the future, but for now we appreciate your patience as we work on Yuumi.
That is a lot of words for saying that she won't be fixed until her midscope happens.
Edit: misquoted a few things