In fact, since neither of those classes uses Devastate for threat, a good DPS warrior can wait until threat is secure and then stack and occasionally refresh Sunder Armor to help increase raid-wide melee DPS. He or she can keep mobs thunderclapped to lower their attack speed, thus reducing the damage the tank has to eat. And if the tank is a druid who is fighting for threat and can’t spare the rage or a paladin who doesn’t have the ability, demoralizing shout can be used to lower the boss’ attack power for more reduction in tank damage.

Even if your tank is a warrior, there are wow gold fights where he or she is going to be doing everything possible to keep aggro in a fight where raid DPS must be as high as possible, and having DPS warriors along who know when to use those abilities for the tank so he or she can focus purely on threat generation is a good thing. The amount of damage reduced by the combination of Demo and TC is really quite important for boss fights.