Disc priest healing through dps is atonement, which averages about 30% of their healing per boss fight, so they dont really do their healing through damage anymore, mostly with Rapture and Spirit Shell. Atonement has become just a background HOT these days. Disc priest literally do the lowest damage of any healers when focusing on damage. Spirit Shell should have been nerfed months ago, but it’s actually the only reason the are brought to raids so yah.
Holy paladins doing 13k dps is completely out of balance. Especially when they finish the boss with equal healing to the other healers.