As long as you don't loose aggro, don't give your healers constant heart attacks and aren't forcing the DPS to hold back, Sword Oath to you heart's content. It doesn't really matter how you succeed at your job, only that you do.
But personally? I'd rather give my healer the freedom to Cleric Stance DPS, by taking less damage they need to heal, than me doing some piffy single target extra DPS.