So, two hundred years of general acceptance (well, aside from that civil war thing where vastly differing fundamental interpretations of how the country can be governed were tested by the tried and true debating tactic of 'how many boys can we send over the trenches') is iron-clad.

But say, 80 years (FDR's expansion of executive power, which reactionaries in the courts are currently dismantling) is not?

Hardly anyone alive remembers it in any other way by this point, and everyone involved in setting that state of affairs has been dead and buried for a generation. And yet...

It's also strange how people seem to be fine to cherrypick a superset of (constitution + a bunch of other two-centuries old political babble), but exclude mountains of conflicting (two centuries-old political babble). It's almost as if the desired outcome is pre-determined, and we're just looking for fig leaves to justify it.