Unfortunately, even if a product owner knows these rules, they might be forced to be become a mini-boss due to organizational culture. For example, developers might ask a product owner to know everything for discussion, no matter in daily scrums or in planning meetings. They think a product owner should know better than them so he could lead a team to craft a product. I agree with the fact "Context than control", so we need further introspect what make a product owner behaves in this way.