So, let me put it in terms people can understand: what is there to stop Biden from having the Secret Service black-bag Trump if Harris loses in November? Or stop Trump from black-bagging whoever beats the Republican that succeeds him in 2028? Or hell, what stops Biden from droning the SCOTUS justices that wrote the majority opinion right now?

According to the Supreme Court, the only appropriate venue for that question is a Congressional impeachment. The only time when it looked like a President was going to be impeached and convicted was Nixon. That's why he resigned. But I doubt that would happen today. In fact, you can blame Democrats for this: they didn't convict Clinton when he was trading sexual favors, even though that was absolutely something they should have[0]. And Republicans refused to convict Trump[1] for holding up Ukraine aid for political advantage or for inciting a riot in the Capitol building. It's like if you couldn't be convicted for beating and robbing someone because you refused to sign the guilty plea.

As for Chevron deference, let us keep in mind that the alternative to Chevron is legislating from the bench. SCOTUS consistently picks the interpretation of the Constitution that assigns the most power to the judicial branch, which they have absolute control over. The ostensible check on this power is Congress writing a new law, but Congress has been hung for over a decade, which means SCOTUS gets to cowboy-code whatever they want.

[0] During the Me Too era of sexual harassment revelations Democrats started realizing "oh wait, we did WHAT back then?!" and recanting

[1] A president so nice we impeached him twice.