A grander theme is seeing the effects of the Loper Bright decision and the end of Chevron (and certain other, but not all, forms of) deference to administrative agencies.
Also consider the more-independent agencies, whose boards don't necessarily change composition when the executive administration does.
I mean this entirely in a non-political way, too: I'm playing devil's advocate.
Apropos of the first point, though, do you trust MTG (for example) to engage in wise gap-filling or overriding of the judiciary when it comes to, say, net neutrality or Schedule I drugs?
That's not a snarky question: it's a rhetorical one, only to respond to your point.
I see both sides of the issue. Truth be told, the Constitution does not provide for a fourth branch of government. But agencies are so ingrained in our fabric that they're not going anywhere anytime soon.