Many leaders limit their capacity as a leader, because they try to do too much on their own. Rather than develop people, they control people. Rather than growing the organization, they only grow their personal workload. In the end, under this type scenario, everyone loses. The leader burns out, potential leaders are never developed, and the organization fails to be all it could be.
If you want to increase productivity as a leader, you have to think bigger than what you can do. In fact, I would say, you have to change some of your title roles as a leader.
Keep reading this article on Ron Edmondson.