I agree with you here, there shouldn't be a strict formula and honestly a lot of the CC that they have is fine. But the way that you can coordinate them needs to be toned down. On my healers, i feel like certain teams can literally endlessly CC me because when one finally DR's, the other is back off of DR.
My proposed change is to how DR works. More things should DR with eachother i feel.
Other than that, as a warlock, i want to give up Shivarra mesmerize. Its so annoying.