This is part of what a legally protected engineering title does. When you stamp something as a professional engineer, you are saying that it meets all applicable codes. That is a legal statement, and to do otherwise would be fraudulent. If you have a professional association that dictates this and has restraint of trade in place so only a member of the professional association can do it, then it's not even pushing back. It's a flat statement: "You have to do it this way or you can't have it stamped."