The most compelling reason for improving delegation in organizations is not to free up top management from overload, nor is it to allow employees to express their full potential (as crucial and real as these benefits both are).
The most compelling reason is that organizations that delegate well reap the value of faster decision-making, closer to the action. In a world that is harder than ever to predict, that is a dependable advantage: customer issues are resolved more quickly, you can stay ahead of competitors, and projects spend less time spinning their wheels.