Many leaders are scared of passing their batons to their subordinates. One reason could be that they are scared of seeing them fail, which could affect the morale of the entire team. Another reason could be that they are control freaks.
One thing I have learned about building a startup is that it is a team effort, not an individual win. At the same time creating a team with giving responsibility to newer blood is a mandatory virtue for success. A founder cannot run as a headless chicken with a nose into everything. When a team grows, scale and performance all suffer.
The solution is adding trust in the newer blood, allowing them to fail, learn, and grow. Sadly we live in a fast-paced, quick commerce world where humans have become robots and culture a battleground.