> Just as Congress doesn't need to explain their Constitutional authority when passing a law, either.

The House requires that, as a rule of the House.[1] Which is why, when you look up bills today, you'll see a "constitutional authority statement". It's mostly a reminder that, unlike state legislatures, Congress does not have a general police power. Most of Congress's regulatory authority derives from its power to regulate interstate commerce, which is pretty much everything commercial now.

[1] https://scholarship.law.ufl.edu/cgi/viewcontent.cgi?article=...