A No one has 4 benedictions on a 25 second cooldown you are absoutley making stuff up. Even then its only in adds in dungeons and the healers should be using aoe instead of cure boting anyway.
The tank with the most self heals is WAR and its designed that way because they have the worst invuln in the game that they WILL die from if the healer isnt on point and often they are not. They also have less mitigation since thrill of battle is extra health and not a mit (it sucks screw thrill) so yes WAR needs its healing unless they want to die though no fault of their own because invuln left them at 1hp and the healers are spamming glare.