When healing with a co-healer, I find it important to always communicate on who does what. When I play a Noct AST or a SCH and I am healing with a WHM or a fellow AST, I always ask if its oke that I do more DPS. If my co-healer has issue solo healing certain parts of the battle, I assit with healing. We are in a team and we should help each other.

I do agree that healers (players in general) who dont care about the group and just do their own thing, should be kicked.