You will always have a tank, and therefore always have the tank limit break.
You will always have a healer, and therefore always have the healer limit break.
You won't always have anything other than BRDs in your group though, so you won't always have the DPS limit break.

Excuses like "but what if both healers are dead?!" are shitty arguments, because it means the group messed up badly and is going to wipe anyways, or is just plain bad to begin with. Don't try to justify BRD having the wrong limit break based on situations that shouldn't be happening to begin with.