On the surface, we would assume if someone is in a leadership position, they would naturally be proficient. Sadly, this is not always the case.
Leaders need to know their job. Imagine the power of a leader who knows his job responsibilities and allows others to do their job.
Leaders also need to be familiar with the job responsibilities of others. When leaders know the job responsibilities of others and provide accountability, progress is eminent.
From a spiritual perspective, think of sheep with a good shepherd. When everyone knows their role and works to fulfill it, the church functions accordingly.