It's better to use a brawl stick and cannibalize inbetween swings or medidate-canni dance if not in melee. Even besides that, there many long-cast spells you need to be doing anyway as a Shaman. You don't have that much time to use JBB. MOBs don't need "super cold resist" to bring down the damage against JBB either, just a regular resist rate on typical content a 60 Shaman would be trying to solo or single group is enough to significantly cut into the damage.
Even if the JBB might end up being marginally better than spending your time on cannibalize + melee/meditate, remember that Iksar have innate AC bonus, which means they are mitigating more damage than a Troll when face tanking. Trolls also get slam, but on the whole I would rate AC bonus as stronger. So then the only factor remaining is the snare clicky Trolls get, which isn't that great IMO. It's a 6 second cast for a low duration, low percentage snare. Not something that can be relied upon or used too efficiently.
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