It's anti-textualist, anti-originalist, anti-legal theory. It's a rule that the Supreme court has to invoke to achieve their objectives because they have no other avenue. The law was clear, the intent clear, and what congress desired was clear. Major questions should be solved by congress passing a revision to the law. The supreme court invoking it robs congress of their power because "we know better".
The reason it's such a bad rule is no lower court or litigant can really invoke it. It is only something the supreme court can use because it's undefined what qualifies as a "major question". Boiled down, it's "we don't like the law congress passed but we can't come up with a constitutional, textual, or historic reason why that law or it's application is invalid".
They would not use "major questions" if there were any other legal reasoning to go to.
Not really. First, any inferior court can also apply the major questions doctrine -- the SCOTUS is merely the final arbiter, but presumably in many cases either there will be no case (because the Executive will preemptively go to Congress) or the Executive will accept a lower court's decision w/o having to go all the way to the SCOTUS. Second, the doctrine is pretty clear: if the impact of a regulation is politically very controversial and its impact on the economy or liberty is quite large by comparison to more mundane regulations, then it belongs to Congress.
Quite arguably, Congress deemed the precipitating questions were not "major questions" and expressed as much by delegating to agencies.
That's a tremendous stretch because Congress can be very vague in its delegation of authority and decades later the agencies it delegated power to can interpret anything they want into that language and -because of the oft-repeated point about Congress' disfunction- the agencies can't be stopped.
> Since "major questions" has no concrete definition,
It's like obscenity: you know it when you see it. But it's simpler: if there's a controversy, there's a chance that the issue is a major powers issue, and then you have to look at whether the liberty/economic impact of the regulation is extreme enough that Congress must decide it.
But then on the other hand, Congress is dysfunctional and is incapable of legislating.
This feels like a recipe for the unelected branch (the courts) to run everything.
