A good hybrid spec shadow can put up 700-800k damage in a warzone
This is nonsense. Big numbers from any class requires time on target which means healing. More healing is more time is more damage. Having said as much, a good smasher WILL dominate the field and the score board. And because its an AOE, guaranteed crit with a DMG multiplier, stacking multiple smashers is not only imbalanced, it's flat out broken. No other reasonable conclusion can be drawn.