Leaders must be technically proficient. There are two primary areas where this principle has direct application.
First, leaders need to know their job. They need to know what they are supposed to be doing. When they do not, the result is disastrous for the overall production of the group and task.
Second, leaders need to be familiar with the job responsibilities of others. Unless leaders know the job responsibilities of others and provide accountability for the work, progress becomes dependent on leadership to carry on the work.
From a spiritual perspective, when leaders are no proficient we find sheep without a shepherd.