How is public policy$-$making a responsibility shared by all three branches of government?

Does the current system of policy$-$making by the three branches of government align with the separation of powers established by the Constitution?

What are the consequences of the current ways that the branches of government share policy$-$making authorities?

Which branch of government has the most influence on public policy$-$making?

what extent is the will of the people reflected in the public policy$-$making process?