This has been a pet peeve of mine in the past, but I've felt it's gotten even worse in Stormblood somehow: DDs not using limit break at all! The bar fills before, during, or right after the first boss in the dungeon. A melee doesn't use it on the boss, and the caster / ranged DD doesn't use it on a huge pull where it would be a huge DPS benefit. Why not?

Why aren't you using it?

(And I'm not talking about content in which it can actually be beneficial to save LB for healers, such as the last story fight, but standard dungeons and trials.)