They've been buffed for a few years now, they have made hilarious buffs and broken sets specifically designed for them. There was a thread like a year ago with some good guild groups commenting how it was a bad idea and would lead to them being even more broken but zos insisted they get buffed again. Like zos has implied either join them or leave.
Could change the behavior of skills like radiating regen to apply the hot to 3 people at a time. Recast it? It goes to three people (new or old) and removes it from anyone your RR was still ticking on. If this was the case I'd prefer the heals go to group members only, for what it's worth.
I still think the organized groups would find a way prevail but people would have to find something else to complain about at least. "Nerf cooperation!"
They even have the code already in the game for Rallying Cry. Sometimes they do make smart things.I always there should be more skills scaling with numbers of enemies/allies affected like a reverse proxy