Nah, it's harder to convey through internet. I did try my best, with the eyeroll.
It's just that his argument that if you buffed all other classes to be closer to havoc DH (rather than nerfing havoc DH hard), all content would become easy/facerollable/irrelevant is silly when a group of three havoc DHs (with a healer and tank of their own choice) can't just faceroll mythic+ dungeons.