Parsing unfair but okay?

[YukikoKurosawa]

It's a dip in DPS that any smart static leader will be able to go "ah, that's why the drop there" and will move on and not use that dip against you solely because you used the LB3. If you use your LB3 in the middle of your high burst phase, the LB3 could lower your DPS. So wait until the end of the burst phase unless you believe the boss will die before you get it off otherwise. And then maybe it won't ding you or as much.

As for others not using it, it simply could be that they normally play a caster DPS or tank or heal and are on a melee class they haven't played in a while and forgot they can. Or they got absorbed in their rotation and forgot to use the LB3. And if you're a melee and the other DPS are either ranged or caster, they're likely expecting you to LB3. Heck even if there are other melees. They may be thinking you'll LB3. I primarily play Black Mage so my LB usage is mainly an LB1 trash pulls and not the LB3 - though I will take it if offered.

I always LB even if I'm a Black Mage, unless we need a tank or healer LB, or if I just feel like being generous and letting another dps have it. I once had a party member in an alliance raid, after I used it on the first boss, tell me I should never use it ever as a BLM because it does marginally less dps than melee LB3.

I just said "K". Then did it again the next boss. I think I used BLM LB3 every single boss that run (we never needed a mass rez or defensive). And yet, we still downed every boss with no wipes or problems at all. What miniscule difference between BLM LB3 and melee LB3 is not worth caring about. Dps LB3 is pretty much just for lulz, the only time LB3 matters is when you need the healer or tank LB.