There is a principal in democracy that there Should Not Be strong institutions that prevent a majority of the population from harming itself with its choices. We balance that against a Supreme Court in the US, but that court is almost uniquely powerful & active in forming policy relative to its place in the rest of the world, and right now, most of it has been appointed by fascists; Ultimately the population will have its say in the long term.
Do you want an extra-democratic body who is capable of telling the population "No"?
I think such a body (which exists in some system) would obviously be nice right now, but I am a lot less convinced that it would be a net positive in general.
If we want to find our way out of this, I suspect a lot of people are going to need to feel directly harmed by this administration, and are going to need to basically erect a strong protest culture out of whole cloth. Something like 5% of the population in the streets can topple an authoritarian regime in the right circumstances, but not the 0.5% we might expect for a "large" protest.
In the UK, the Prime Minister has a lot less discretionary power, but much more ability to get legislation changed.
So when a political question arises like "should we have net neutrality?" the elected politicians decide and pass legislation.
That's in contrast to the US, where someone decide the executive was granted discretionary power over net neutrality in 1934, several generations before the net was invented. Then the executive decides there will, then won't, then will, then won't, then will, then won't be net neutrality.
> There is a principal in democracy that there Should Not Be strong institutions that prevent a majority of the population from harming itself with its choices.
Wrong. Democracy means only majority rule. What you say is true of republics, which the USA is. However no republic can be perfect in this regard, because it's all just human beings. In this case the president is plenipotent within the executive branch, the Congress is in the hands of the same party, and the SCOTUS is largely on the same page, therefore all the institutions in question are not going to stop him unless he does things that are outrageous to the public, keeping in mind that the HN commentariat is a tiny portion of "the public".
There is one, it is called a Constitution, and any rules where changes are only accepted by a qualified majority not of 50% but of 66% aka 2/3rds.
The electoral college was intended to serve this purpose.
"Do you want an extra-democratic body who is capable of telling the population "No"?"
There's value in having speedbumps that keep 51%* of the population from shooting 100% (or 99%) of the population in the collective foot... or in this case, head. The institutions aren't anti-democratic - they were put together by democratic processes, and each speedbump is usually there for a reason. Sometimes a long-forgotten or no longer good reason, and it needs to be dismantled, also by the same type of processes that put it there. Yes, I want people who won't be easily and summarily dismissed for following the law and regulations even when they're not popular. I want regulations and guardrails that can't just be swept aside by an administration that rotates out every four to eight years. (I'm generalizing a lot here, of course...)
*Really much less than 51%, given that a large percentage of the population doesn't vote, another percentage of the population's vote is suppressed, and another significant percentage of the population is not yet old enough to vote...