The problem though is that then the healer can't do anything much at all unless they are very good; the cc literally locks them out of play for 5-9 seconds or even more. And the burden of reacting to that is almost always on them alone; even in 3.0. They have to constantly los, use crowd control effectively, and fight off cc that can knock them out of the battle completely while still keeping the team up. You'd end up more or less forcing healers out of the mode, which is what happened back in the day.

Idk what solution is. The 4v4 thing I don't think works because they can't really nerf a single healer enough to make them less potent and still playable.