>But fundamentally, how is this different than what the Supreme Court does? The Supreme Court interprets the constitution and its meaning as it relates to whether or not a law is constitutional. The overturning of Roe v Wade is the direct result of the current court saying 'actually, the way we previously interpreted the constitution was wrong'.
That's sort of the point, because congress has abdicated their responsibility for so long, many of the "laws" and "rights" that exist in our legal framework are mere shadows of actual legislation. They're executive whims or judicial policies, both of which are inherently fragile and subject to sudden change. Roe v. Wade was the "law of the land" only to the extent that the courts continued to interpret an ambiguity in the law the same way as they always had. Congress had decades to shore up a case that even the jurist who were part of it said was extremely weak. Everyone knew it was fragile and the DNC cashed in on that fragility every election.
Or consider medical marijuana, which is currently only un-prosecuted at the federal level because the president told the DEA to chill out for a bit. The fact that in November the next president could change their mind and conduct federal raids of dispensaries across the country is not a good thing. You might argue that they couldn't do that because the medical marijuana industries and laws are crafted to avoid crossing state lines, but that depends on A) ignoring decades of Wickard (which admittedly the current SCOTUS might be willing to do, but boy if you think this decision or Roe was controversial, that would be a doozy) and B) ignore the very obvious fact that some of that legal supply is leaking across state lines illegally.
The fact that Net Neutrality is on again/off-again is another example of this. Major legal decisions are being left to the whims of two octogenarians who it's a miracle manage to get through the day without shitting their pants, and a judicial system that is inconsistent at the best of times. The courts have always been political, but if they are uniquely so at this time, it's because the folks interested in politics have figured out its easier to get what they want via executive fiat and judicial wrangling, and congress has learned their jobs and income are more secure when they don't have to take the blame for those things.