Happier to see Yuumi weak upon release and being fixed once the data comes in rather than being some perma-ban tier monster like we had w/ a lot of champions for months on end throughout S8/early S9.
Remember, PBE has historically been mediocre when it comes to helping to balance champions for the live servers.
She already got an Hotfix
https://na.leagueoflegends.com/news/game-updates/patch/patch-910-notes#patch-mid-patch-updates
I would rather have a broken champ on release for the lolz rather than my ADC to ragequit and blow up to orbit.
Things that are adorable are W E A K