Ops have regular trash too, plenty of them, larger groups considering it's an 8-player thing.
If tumult and moves like it really are that important to DPS, I must not be pulling my weight as a DPS at all with Priss (Gunslinger) or Silvana (Marauder) since I never used their equivalent moves at all. Don't really have all that much trouble managing their energy/rage unless I end up doing something stupid like over extending a DPS burn and not pulling back when I'm supposed to.
I dunno... I guess since I've never relied on it, it's value is just non-existent to me.