Aside from severe competency issues I would agree. But I don't think classical "leader" properties are important. I agree that a manager may need a certain distance, but that depends on the team. Engineering is a creative process and too much structure kills innovation.

A manager should be the slightly less annoying customer that ensures customer perspectives are not neglected and work is prioritized in a matter that ensures project viability and success. And can clearly tell what he needs. Granted, that is quite rare in the industry. Especially those that can organize and take responsibility.