These arguments are tiresome, no matter what role is asking the question.

If you are the one breaking the group synergy in group content, you are the problem. I don't care if you're a tank pulling to little or too much, a non-tank pulling without explicit permission, or any other role not communicating their skill level and intent when it becomes apparent it differs from group expectations.

Learn to play well with others, communicate, and compromise to be what the entire group needs. Or, leave and find a new group if no compromise can be found. Anything else is childish and selfish.