Earlier quoted context omitted.
Why do you see a blow to the chevron deference doctrine as a good thing? I'd say that the doctrine properly tries to keep the supreme court, the least democratically responsible branch of US federal government, from being the most powerful of the three branches of government.
The least democratically responsible branch of the US federal government is the administrative state.
To me, it seems clear that the "administrative state" is overseen by the president, who can overrule them and fire individual people, and the president is elected by the people every four years, and that makes the executive branch more democratically responsible than the supreme court, which is not elected by the people, and who serve for life with no democratic accountability.
But I'm open to hearing your argument for how the supreme court is more democratically responsible than the offices of the executive branch! Maybe we don't mean the same thing by "democratically responsible".