Not every spell needs to be applicable all the time.

For instance, I used tri-disaster plenty back in the old wanderer's palace speedrun days...you bind the enemies outside of the boss gate.

That was awesome?

Like I'm not sure what you want here. If all of our skills did awesome damage we'd still just end up picking the ones that do the most and ignoring everything else.

Granted, SMN -does- need an actual useful AoE spell, but our AoE dots with bane, miasma II and sflare actually amount to a decent dps, without destroying our mana.

Of course not compared to Fire II (not even going to mention flare here), because BLM aoe is broken and the devs are stupid in thinking that an infinite resource class is balanced against all other classes in AoE.