I've been on both sides of the fence. I've been an undergeared tank trying to keep enmity from endgame DPS that refused to let me get something into position or use Quelling Strikes, and it's incredibly frustrating.

I've also been a MCH that began to pull enmity away from the tank because they were undergeared. It feels good to know that I'm doing my part, but it feels better to stay alive and let the tank do their job. So I hit F2, and Quelling Strikes was activated.