because the AOE Hot is great, if you need to heal 3ppl anyway you can just as easily heal 4.
&why move if you could stand still just as easily?
you are a sorc with your AOE puddle you can place in the middle of the boss He's an Operative he places himself there so he doesn't need to explain the D-drones one should place itself so the AOE HOT affects Tank and Drones.
Not taking damage beats taking damage. Being able to heal beats not being able to heal. That's true regardless of class and gear.