B'zzzt. False.
Law sets policy.
You demonstrate here how confused is your view of our governmental structures and process. Your misunderstanding could be cured by taking elementary civics.
The Executive branch executes the policy prescribed by the laws issuing from the Legislative Branch. It is not the prerogative of the Executive to change policies already set in law. It must go hat in hand to Congress and recommend a change.
Why do you think that the Statue of Freedom is on top of the Capitol Rotunda? Mere decoration? No. And it is not meant for empty boastful symbolism...but a reminder of where the actual People's house is, and where self-rule, and hence Freedom, has its seat.
The Executive may be given a circumscribed free hand, i.e., within limits, to craft policy or policies in pursuance of that implementation of the pre-existing legislative edicts...but it is ultimately a definitive function of the legislature to set policy and reign in any abuse of the delegation of its authority.
The legislative act is not a mere rubber stamp approval of the executive.
Feel free to argue for a "weak presidency." Any number of constitutional scholars have. And quit the BS about "elementary civics." I had that in 5th grade.