I believe that BLM didn't use quelling strikes.

There's a lot of idiot BLMs that just go raging strikes and flare the shit out of everything without the tank gaining sufficient enmity. It's not just BLM only. As a BRD I also possess the burst that could rip off a very geared tank if I wanted to.

I don't think currently there's any issues. With proper communication and timing, as a PLD in Brayflox HM speedrun I've seen PLD and WAR alike that could old a i100+ with i110 weapon BLM's triple flares. BLMs should know that flares generates lots of enmity, and generally BLM does generate lots of enmity with the fire3 procs. And thus they are granted access to one enmity management tool which is Quelling Strikes, but some BLM just don't bother to use it..