Lazy players don't like hate reset, If content really gets challenging and we need more then 1 tank per boss/fight then hate reset works fine and you can learn to balance the hate between the 2 main tanks. I imagine a boss that hits soo hard that the tank needs both divine veil and sentinel to survive. So the 20 seconds when 1 tank has both abilities on cooldown is when the 2nd tank steps up to #1 hate. Learning to balance hate with a 2nd tank is something I look forward too greatly.