The game does a terrible job of training people to use it . The game doesn't tell people that LB is per party after the new patch so multi raid parties have one of their own to hit the boss with now. Few read patch notes.

Many people think that you need to save it for LB3 in a dungeon by not using it at all until the last boss which is a waste as the LB is limited by rank depending on the encounter so it will not charge past that rank until the final boss (trials are a single final encounter so wil go to 3 from the get go). Many dont know that in certain duties the LB2 you have accumulated is scrubbed the moment you attack the first boss ( MSQ Nero for example)

Also:

Everyone needs to help rid the crummy myth that LB is for bosses only in dungeons and that it does more damage if the Boss HP is under XXX percent its incorrect on both counts . If you see players spouting this nonsense please kindly inform them of their error.