When I was still playing, there was no "default" regen within the five second rule, unless you had said gear or talents. May've changed since then, but whatever. . .
I saw your response to Noc, but I don't think it's. . . correct? Not quite sure what word to use there. I know that the timer used to exist, and it might still actually exist. For all we know, all they did was set the "Lower enmity by this value" number to 0. There'd be no way to tell the difference between that and a complete revamp to the system without seeing the actual coding. I'm not saying that's definitely how they did it, but I could easily see them re-purposing that function for this, even if it means re-introducing it.
Even if you find seven healers who know nothing about tanking, they'll notice real fast when the boss turns around and eats them, again and again, because the tank can't hold aggro. Or when the tank can't stay alive. Or when efforts to keep the tank alive result in the tank being the only one left alive. . .
Okay, edits:
You're saying that 4-5 healers was determined within hours of people getting there. This video was uploaded 3 days after the patch went live. It shows three healers, four archers, and a gladiator tank. You can't even really argue that this was a result of skill (no offense to those involved in the making of the video), because there's so much this group could have done better. Not even counting that they could have triggered drops on purpose, they never cast Stoneskin on the tank after the pull (from what I saw, anyway). They basically got through the fight because they had a resilient tank and a little bit of MP management. Heck, they even spent several hundred MP healing their DPS.I'm really not exaggerating! Do you not believe that parties were formed with 5 healers based on healing 1 tank? Do a forum search for GLA CON ARC Darkhold and read what you find. I know it can be done with less healers and skilled players.. but we are not discussing that are we?
Not bashing the guys that made this video, but if they can take 3 healers in and heal not only the tank but also the DPS, with only one piece of dungeon gear among them (from what I can tell), without even doing everything they can to manage MP, then I have to wonder wth people were doing with 5 mages standing there. . .