At low levels, the difference in damage intake between warriors and other DPS isn't significant enough to hold DPS until aggro. Sure, casters should wait a bit, but melee DPS should go nuts. You do not have complete heal available, so HP/mana per heal is the same throughout the group. The only difference is mitigation which isn't significant yet.
At high levels (50+), slowing the mob ASAP is most important factor. The slower will likely be tanking over a warrior, so someone taking aggro off the shaman/enchanter isn't a huge deal. A clothie will take less damage on a fully slowed mob than a warrior would on a unslowed mob. In these scenarios (virtually all exp mobs), it doesn't matter who is tanking a slowed mob in an exp group.
Holding DPS until aggro is useful for situations where pulling aggro is certain death. These situations don't come up much in your standard exp group. The gain of healing/mana efficiency on plate is not worth the sacrifice of DPS in an exp group.
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