Originally Posted by Blizzard Entertainment
Anti Ninja Loot System
If only tanks can roll on tank gear, then it becomes really hard for anyone else to build up the gear they need to be able to tank.
Tanks rolling on dps gear makes it harder for dps to gear up and dps rolling on tank gear makes it harder for tanks to gear up.
Lets say you kill a raid boss and a tank item drops, who deserves it more? The mage, the rogue, the other dps or the tank?
Thats why only tanks should be allowed to roll on tank gear and dps on dps gear, if the tank hits greed/disenchant/pass, then and only then would the need button unlock for the other plate-wearing dpsers.