The stigma is warranted. It's a 150 potency gain for the CNJ and between 200 and a few thousand potency loss for the party if you use it wrong -- and most people do. What you call "one of his best dps abilities" is easily the biggest damage loss in the game if the mob is movable. CNJ should be contributing meaningful damage, and there are ways to do it without screwing with the rest of the party's damage output.
For reference, a 6-target Flare is 2106 potency in a single cast. If you Fluid Aura the wrong mob in a two BLM party, you turn a 4212 potency GCD into a piddly 936 plus your 150, for a loss of 3126 potency not including whatever the tank lost over it.
