I'm not sure how it's irrelevant since I still use butcher's block combo after I held hate. I always BB when I have a fresh SE buff and slashing debuff just too keep the hate as healer aggro, especially in savage raids where healer aggro can creep up fast. O4S is a good example because of all the enmity resets and high aoe healing. BB combo is working as intended and the only time it should get buffed is if SE and SP are buffed as well.