Healers can put some dots on and broil 2 but I rather want a healer that does healing and keep the party alive than a healer that is too focussed on DPS. Remember the main job is Healing. If the dps is lacking and you meet enrage, the DPS classes fail at their job and should improve. Tldr; Don't blame the healer or tanks to cover up your shortcomings as a DPS.