Your comment is completely wrong:

For example:

> Overturning Chevron became a mission of the conservative movement

Chevron’s biggest proponent was Justice Scalia!

> A consequence of that was that the Supreme Court accepted an interpretation that executive agencies should be government by the Administrative Procedures Act ("APA") instead. So that's been the law of the land since Loper Bright.

Executive agencies have always been governed by the APA. That’s why it’s called the “Administrative” Procedures Act.

> To change an agency rule now requires a complicated process unde rthe APA of proposing a rule change, getting public comment and generally following a statutory procedure

That’s been true since 1946. That was the whole point of the APA. Chevron itself arose out of an EPA rule making under the APA.

You’re completely mistaken about what Chevron was about. It was just about whether courts must defer to agency interpretations of ambiguous statutes, or whether they get to decide the interpretation themselves.