The inability of executive agencies to create regulations will extend beyond one presidential administration. Given that conservative administrations tend to favor cutting regulations anyway, this jurisprudence will likely impact liberal administrations more than conservative ones.

Sure. Off the top of my head, consider the nontechnical, non-expert representatives and senators in the upcoming Congress — who, now that Chevron deference is gone, will have to fill in gaps and cure problems caused by adverse or simply wrong decisions by the members of the judiciary (who are also nontechnical and non-expert in the various fields covered by the agencies). If Congress can pass anything, let alone get it signed into law, that is.

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.