Few tanks have a raid CD at all, the ones I can think of are hotw, tranquility, and avert harm + zen meditation, most of which are only or best used when not tanking.
All hybrid DPS contribute some sort of passive healing: HST, VE, hotw + tranq, healing tide/AG, some at the cost of, some not at the cost of DPS. So rets definitely could use the raid utility, they do have the level 90 talents and selfless healer, but the devo does help.