Groups tend to be smarter or stressed together. Which they are determines their velocity, alignment and agility. There are two prime reasons why groups don't act smarter together. They don't have a process to support it and they don't have confidence in themselves as a group.
The lack of process is quickly resolved when they learn the three smarter conversations of intentions, questions and sprints. The lack of confidence is resolved the more they use the process to share progress and success.
The problem of strong leadership is that it is a very effective way to keep groups lacking a smart proces and confidence in their collective wisdom. The stronger the leadership, the more these deficiencies persist. The good news is that the more a group grows their fluency in the process and confidence in their talents, the more they outperform any levels of compliance they achieved with strong leadership.