Why won't you limit break?

[BloodRubyXII]

Honestly, in dungeon runs you will get more time savings from using caster LB1 on large groups of mobs than on the first two bosses, especially after all the AOE nerfs.

This is one thing I have never understood in dungeon runs. People don't LB until the last boss. I did it once was a baby lvl 16 SMN in Satasha once after the 3rd? boss called in the wolves and got screamed at for it.