I'm this game inside dungeons and raids healers are not REQUIRED or EXPECTED to dps outside the most recent raid instances. Healers only dps in progression raids or if they are comfortable enough to dps. By the time you get to this content you may also feel more comfortable to dps as well. The Healers that dps are the ones who know their class well and how to balance healing and dpsing. Since you are on trial you haven't even hit the tip of the iceberg yet keep on truckin and see how things turn out.