I'd suggest you give root rotting a try and get good at it so you can compare the two methods before calling my post ignorant.
Can kill twice as many mobs in the same amount of time as a JBB shaman and still maintain mana and health (probably easier).
The only real argument is that perhaps Ogre shamans with FSI can park their butts in a corner and tank a hard to root mob but they're probably not using JBB doing that in the upper end of things either.
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