I understand the hate for this, but as a healer main I am of the opposite. I don't like tanks that don't pull everything they can. My reasoning for enjoying it is the challenge as if the tank is only pulling one group at a time then you don't have to use any CDs to keep him alive and the tank really doesn't have to pop cds either. When I am playing a healing job i don't play much I need to be forced into a tight spot to improve and train myself to know what CD works best for the situation. When a tank only pulls one group I'm just like "whelp this is gonna be a longer run". This seems like just a pure communication thing, there is no win for this just tell your tank what you're comfortable with.