Originally Posted by
Brokeback
Might be slightly easier on the enrage, but enrage on its own isn't the 'real' issue for most guilds when solo tanking. It's not losing too many people through foams/multi-headed/spits that you still have the DPS to kill him.
An extra tank will screw up comps that are melee heavy in terms of who soaks which breaths/foams. This also increases the risk that someone gets gibbed by multiheaded.
Also, for guilds running a solid solo tank like guardian, it was probably easier for healers to just focus on a guardian tank instead of healing both a guardian and another tank that's weaker at this (e.g., pally). Extra healer attention on the new tank takes away from people getting flame spit after breath. On the other hand, it makes it easier for guilds that didn't have access to a good tank for this.