My thing is, it's more unnecessary added work.
That's it.
Healer - Casts Regen.
Tank - Runs in.
Mobs - Gunhoe to healer.
Healer - Almost dead and running around like a chicken with no head.
Tank - Runs, follows healer, DPS trying to help, time is being wasted.

People rebuttal can say "Oh well let the healers run to you!"
Not all healers do that, also I'm a tank and I do not need your help to manage or collect aggro.
Like I said in the other topic, don't make peoples jobs harder for no reason...Even though it's not
hard to really do all that, it's unnecessary. You guys want speed runs? Well stop doing all that
extraness then. :/