Cause it's a girls only club, that's why
Together as a team of 4 (2 players, 2 companions) we have Priss, Manta, Risha and Elara... but yeah, in that one instance when mim was by himself he could've used 4X.
However, in our regular group, I'm basically tanking the entire time while the 3 DPS blitzkrieg the mob and Elara heals me constantly. Works very well, fights are quick, enimes are dead.