[nerdright]

I bet a lot of commenters here don't understand the extent to which this ruling will apply.

The ruling affects cases where statutes do not explicitly grant interpretive authority to the enforcing agency. When a statute clearly delegates interpretive authority to the enforcing agency, the agency's interpretations will definitely prevail in the courts.

So this ruling is not as terrible as most comments think. If anything, it's very rational. If a law explicitly applies to X, you don't want the executive branch applying it to Y and Z. That's how you create a rogue executive branch (even though you may be well intentioned).