Could you drill down to specific examples of things Trump did that you think no president should be able to do?
I'll go first but in an ironic way. Trump pulled out of the Paris climate accord which, if you peruse the Constitution [1], you might notice Obama entered the U.S. into seemingly illegally, without consent of Congress in the first place [2]. How did that happen? The Kyoto agreement was also never submitted to Congress for ratification [3]. And let me show my cards and say thank God we never ratified these documents, as that would be tantamount to allowing a world government control over our economy. Treaties you see are the supreme law of the land around here [4].
I don't know if you'd consider Trump's action on this particular treaty to be part of the shit he "got away with" but I find it to be a fitting example of something your average Republican president would probably just go along with, knowing it's a toothless treaty that would never be ratified. But Trump, for political or whatever reasons, felt like reversing Obama's policy in the same way he implemented it. And Congress having no part in the whole affair.
In fact the vast majority of what Trump did was in the form of executive order, most of which had very little impact on state's or individual rights.
So yeah what are these things that Trump did that Congress was either remiss or enabling him to do? If it's stuff related to the border, immigration policy, foreign policy, or the like, that's mostly outside Congress's purview, except the aforementioned treaty power.
Just trying to figure out what's the ethically sketchy stuff that should have been checked by Congress or perhaps the courts. That way we can narrow down a set of principles that could possibly apply to Biden (assuming he's elected).
[1] https://www.law.cornell.edu/constitution-conan/article-2/sec...
[2] https://www.washingtonpost.com/news/volokh-conspiracy/wp/201...
[3] https://en.wikipedia.org/wiki/Kyoto_Protocol#Non-ratificatio...
[4] https://constitution.congress.gov/browse/article-6/clause-2/