Wouldn't that just make the LB overpowered? If you have 4 people smashing off their own LB.

And dungeons aren't easy for everybody. There are new people entering the game all the time. They are challenging if you have an at-level group.

Plus, giving everybody an LB in a dungeon doesn't really work to 'train' you for that other content, though. One of the main purposes of dungeons is to train people to do late game content e.g. raids, trials, etc.

Bet you would be the first to complain when a newbie thinks everybody has their own LB and blasts it off, ruining the party