Like what the fuck... honestly. Why the hell would I LB a frickin trash deacon?
Caster and ranger LB is pretty much half the damage of a melee LB
on every target it hits. Which means that when used on two enemies, it's about the same damage output, but when used on 3 and more, it's actually more efficient to use an AOE LB.
The thing with dungeons and LBs is that they basically do not matter in the large scheme of things. However from the pure mathematical standpoint it's faster to
- Use LB as soon as it's up
- If at all possible, use an AOE LB on a large mob pack (3 and more).
It only makes sense to keep LB at 100% of the gauge if you know for a fact you're gonna want to save it for some sort of mechanic (could be something as trivial as pushing phases in the last boss of Sastasha). Otherwise just light it up.
What LB is
not is that it's not a finishing move designed to kill off a boss. That's completely wasteful.