A CEO's job is to delegate responsibilities, and an essential part of delegation is deciding what to delegate, and what to handle yourself. The latter depends o

A CEO's job is to delegate responsibilities, and an essential part of delegation is deciding what to delegate, and what to handle yourself. The latter depends on the CEO's passion and skillset, and since engineering and design is where Musk's lies, that is what he focuses on. Most CEOs have humanities or social sciences backgrounds, so they focus on the non-engineering aspects of the business.