Right now I see a lot of Yuumis that just permanently attached, leading to them just Q spamming and healing whenever. Was that a playstyle risk/concern during their development?
We figured some players would want to play it that way. As a playstyle it functions, although the tuning as it is probably makes it lower win rate than we'd like. The good news about it is that Yuumi is the kind of champion where while you're doing that, you'll have the time to explore other things you can be doing. Times to ward, times to auto attack, times to hop between your allies. It remains to be seen if this playstyle still sticks with Yuumi players or if over time they learn to access the full range of her power.