It all depends on when you LB'd. Like how much HP the boss had left.

DPS will often wait until the bosses HP is low enough before LB'ing, or just low enough to where the LB will finish them off instantly. If you LB before that, you took the LB away from the DPS basically, who could have ended the fight sooner.

Just gotta accept that the tank LB is garbage outside of when it's forced like T13 use to be, or in rare cases like the bad groups on the cloud of darkness. Simply telling a DPS to LB in party chat would serve it better, and if they still don't, guess you get to see your cool tank LB because the DPS aren't paying any attention.