The Black Mage Rotations

[Youmu]

It's really only the first Flare that would be problematic. After that, the damage is more or less the same. The difference is like 10 potency per GCD at max, so unless you're completely riding your tank's ass with the "worse" rotation, you won't pull with either one.

Its usually a combination of the first two flares that can make it a pain to tank, since you get RNG crits on the same 3 mobs and pull huge hate. You'd have to hold off longer to let the tank build threat, or risk making mobs impossible to tank, which is a net DPS loss in practical situations. You should also consider your chances of successfully completing a flare cast while getting poked by mobs, in comparison to fire2.

I think you're underestimating the threat we can generate a bit.