Lol. Nice backtracking. I sense a theme. You didn’t say the president’s cabinet needed replacing. You said the entire executive branch needed replacing, which would include people the president doesn’t have the power to replace. You want a unitary executive, but only if the executive is a democrat.
And, there, is the difference in you and I. When I think about separation of powers / the structure of government, and constitutional law more generally, I think about it in non-political terms. Should the executive have this or that power, regardless of his (or her) party? If Bill Clinton should have the power to fire Ken Starr, then Donald Trump should have the power to fire Robert Mueller. You are utterly incapable of thinking this way. You are a political animal through and through. The structure of government is irrelevant for you. The only question for you is whether this or that interpretation of the constitution benefits your party. This is your guiding star — political expedience. It’s precisely to safeguard against people like you that we have a written constitution to begin with, with rules that apply regardless of which party is in power.