I am still pretty new to the game, with a week left on my free thirty before the sub kicks in, so I ask in all sincerity what that quote in the title of this thread means, especially coming from a tank.

Was doing a basic Qarn run, put Regen on tank, switched to Cleric Stance, and did lots of Aero and Stone II during trash and boss fights. Re-upped Regen when it expired. Helped clear trash faster, tank's health stayed way up. Rarely needed to drop Stance and use Cure II. Run was going fast & smooth.

Halfway thru I get that one line from tank before next pull. So I stop using Regen during trash, have to use Cleric II a lot more, tank's health on average is lower (I also use more mana but that doesn't matter), spend less time in CS helping with damage. Basically from my pov things were worse.

Didn't get a chance to ask why he said that 'cause I type slow and we kept going full speed ahead, but, I am baffled. Is there some reason not to use Regen on a tank during trash pulls?