This is a nice post. I think you're right, and I'd even want to push the question further: when is an executive really necessary? Why do we even have a president?

Yes, there are some instances when a quick decision needs to be made with authority, but even many matters involving war and foreign policy can and should be handled by the legislature.

It's sort of my view that the executive branch is a holdover from the monarchy thing. It makes me wish we just had a prime minister and some impotent figure head if we really needed some "head of state".

But, I'm pragmatic enough to know it's necessary in some cases, at least. I just think it needs to be checked as much as possible to avoid tyranny (and this is exactly what the founders worried about).