Hey Riot This Item is broken on one champ. What are you going to do about it?
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= Full stacks very easily and stays at full stacks very easily.
Its 100% broken on her.
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= Full stacks very easily and stays at full stacks very easily.
Its 100% broken on her.
Lose stacks if the person she's attached to dies. She's the only one it's broken on, so it makes sense to make it a champion mechanic.

make her have like a timer where she can only stick to people for a certain amount of time. Example: 60 seconds are allowed on, then a punishable 5 second switch timer that Yuumi must wait out when either voluntarily detaching or being forced off, so yuumi players will actually have to play the game
Literally the only time you'd stay on someone for a full minute as Yuumi is if you're terrible or they're carrying you around the map.
Like that'd be almost entirely meaningless of a change.
Im gonna say that the majority of Yuumi players in low ELO do this. I think this change would help during the laning phase, because if yuumi decides to detach, she needs to wait to get back on, leaving her open to be punished by the enemy botlane.