As a PLD it makes me cry inside when DPS do not use a full 2 bar limit break on the boss. I got so fed up I made a macro asking DPS to punch the boss in the face with a LB. I toss the macro out around 25% because by the time DPS use LB boss is around 15%. I use it on my RDM/BLM when melee do not use it and boss is around 20% because some would rather focus on their rotation than finish off the boss who has < 10% HP