I suppose in that case you are wholly opposed to the regulatory system as legislative power should be part of the legislative branch?

Even people who believe the administrative state is constitutional rest that conclusion on the premise that "rulemaking" is merely the formalization of the exercise of enforcement discretion. But that means that rulemaking must be performed by the executive branch, because that is the branch charged with enforcement of the law.

DMCA rulemaking is actually an example of something that would probably be constitutional if the executive did it--even if administrative agencies in general are unconstitutional. The DMCA creates civil and criminal penalties, and calls for rulemaking to define exceptions to those penalties. Defining exceptions to civil and criminal liability falls squarely within executive enforcement discretion.

I don’t think it does. Discretion is fundamentally case by case. Drawing categorical lines is legislative.

It’s akin to the distinction between law and equity courts at common law.

Stepping back, both doctrines (non delegation, unitary executive) are fundamentally about the courts overstepping. If both houses of Congress pass a law creating an agency with a director that can only be fired for cause and the president signs it, the Supreme Court should stay out of it.

Enacting legislation is very difficult, the presumption of constitutionality should be taken more seriously.

> Drawing categorical lines is legislative.

That’s even worse. If that’s the case, Congress must adopt those exemptions by law. It can’t delegate lawmaking powers to its employees.

> Stepping back, both doctrines (non delegation, unitary executive) are fundamentally about the courts overstepping

Unless you toss out the concept of judicial review altogether, policing the structural rules of the constitution is exactly what the courts should be doing. The courts have no say about the merits of Congressional acts. But they should review whether Congress has allocated powers to various entities in a way that’s consistent with separation of powers.

That’s too high a level of generality. Sure police situations where the branches are at direct loggerheads.

But in this case we have a law passed by congress and signed by the president. There’s no need to step in, the ordinary political processes are more than sufficient. If the new President and congress doesn’t like what the last ones did they have the exact same tools at their disposal to undo it.

Let them play!

Well, probably in theory. I don't rate that on my top 50 issues I care about and haven't given the idea much thought. But having the legislative branch be responsible for the regulatory system does sound proper.

The US executive branch has very limited decision making bandwidth and it should really be reserved for matters of war and peace.