100% SEAL OF APPROVAL!
You know you can see a Chaos Bolt coming, and is easy to interupt it or break LoS or distance.
Us Warlocks, we have no mobility. We can not also cast and move. Once our target is out of range, or has no LoS, our cast is interupted. On top of that, nearly every single spec in game has some sort of CC or Interupt.