BA Shared Topic: Does WoW Need Another Party Role?

A very nice shared topic brought up by Fumbleknock from WoWblog Plus.
To answer this we have to take a good long look at the fundamentals that define our World of Warcraft:
Damage
Everything evolves around it.
- Tanks should receive it exclusively, because they have the tools to handle it best.
- Healers need to heal the damage caused in order to keep the players alive.
- Damage Dealers need to deal as much damage as rational possible to prevent the mobs from dealing damage as soon as possible.
So, we have a role dedicated to damage mitigation, one for damage removal and one for dealing damage.
Even utility abilities can be sorted into one of these categories. Polymorph, for example, is a tool for damage removal or damage dealing (sheeping a healer). Curse of Weakness on the other hand is damage mitigation. The list goes on and on.
