Is limit break not a thing?

[Dualgunner]

None, but you didn't specify "endgame fights". Your statement was "In almost every fight melee LB3 is optimal," which is false, because the majority of fights in the game are trash mobs. Although I find it interesting that you decided to pick out my mostly sarcastic statement to criticize rather than the rest of my post.

To be fair, what trash mob fights even grant access to LB3?