They don't need to be a "pet" class. However, it'd be nice if it'd follow me when I'm not in combat, and if they'd move in range of whatever target I'm targetting. Specially when a tank goes to dodge an AOE and never comes back .

Lastly, I think when I blow up a turret, it should only block THAT turret from being ressummoned for 30 seconds. I should still be allowed to use the other