As an engineer, I can make objects work.
As a teacher, I can help designers and engineers create objects that are personally meaningful to them.
As a leader, I will help guide others to become better, so that their work is more valuable to them and to the team.
In any case, a great leader serves the team and sets the tone. While a large part of it regards creating a vision, a significant part of it also has to do with teaching the team about my own experience and thought process. Great leaders can communicate well and entrust others to tasks because they know they have taught the team well.
And vice versa, if great leaders are great teachers, they are also great students who learn from their teams.