It is a mistake to assume that the solution which works in industry is equally applicable in government. Businesses and governments are very different institutions. They have different missions, different stakeholders, different legal obligations, and different responsibilities.
Surely, things would be more efficient if we just had one large uniform, monolithic state institution, but a (small R) republican state cannot exist without extensive delegation. It is only though the process of delegating power to states, counties and municipalities, that we can even attempt to execute the will of the people.
This all comes with tons of redundant infrastructure - thousands of city councils, mayors, police departments, courts, and school systems. 50 governors, 50 state cabinets, 50 independent boards of elections, 50 different state legislatures - but each community has its own needs and its own ambitions, and nobody knows those needs better than the community itself.