As a leader one must motivate, inspire, set standards, coordinate, improve, communicate, collaborate and so on, but they should never mistakenly believe and act as if they know everything.
There is a multitude of reasons why teams are built with people of diverse backgrounds, experiences, knowledge and education in order for them to complement each other and cover all responsibilities. Leaders are not the only resident experts in all areas they lead and should be honest about that and promote the knowledge and expertise of others across organizations.