I think a big portion of complaints I’ve seen in game, from friends etc., is that Yuumi has to choose to be interactable with by the enemy team.
An enemy has no tools to force Yuumi to be interactive except solely by killing the champ she is attached to. If Yuumi wants to sit on a juggernaut or tank and spam E late game she can and there is absolutely nothing the enemy can do about it.
Yes, it may not be the most optimal play, but considering the vast majority of players are Gold and below, it becomes extremely hard to feel like you have options against her.
If there was some way to force her off of a champ, through aoe spells or hitting enough hard cc on her attached champ or something to allow champs to detach her, even if its difficult to do, would give some tangible agency back to opponents.
Her problems tend to stem a lot from perception rather than balance, which seems to be a running theme with a lot of newer champs and reworks lately that pe...