In Garuda normal, sometimes people like to use Tank LB during reckoning.

The LB system isn't very good. No one wants to use the tank or healer lb because the party shouldn't need them if everyone is doing their role. The dps lb is sometimes helpful to take out adds quickly.

It's also a big pain to build up lb. If I could make a change to lb, I would just give people an lb for certain fights. Maybe for dungeon bosses, lvl 1 lb for first boss, lvl 2 for second boss, lvl 3 for final boss. Then people could do one cool move during the fight.