The US Constitution is an evolving document, and I note the quality of its amendments shows why the bar on amending it is, and should be, so high. The longer an institution exists, the more corruption it suffers, and one of the reasons the USA has managed to reach the median lifespan of empires shown in Sir John Bagot Glubb's 'The Fate of Empires' is that high bar.
More responsive Constitutions allow more rapid degradation of polities, which reduces them to intolerability more rapidly, and they are replaced more rapidly.
Federation of states seems to me to have run it's course in the world today. The EU is clearly destroying it's member states, and the USSR was shed by it's member states. Trump seems to be taking the Caesarian option, transforming the republic into an empire, which extended Roman civil societies' duration to almost twice the median lifespan of empires.
Anyway, after a couple centuries, laws matter little in polities because corruption has rendered them merely bedtime stories for children. Attempting to amend the US Constitution now would occur in the hopelessly corrupt environment that has evolved over 2 1/2 centuries of cumulative infiltration, that today features the glaringly obvious rule of spooks by blackmail of almost every elected official and bureaucrat, not only at the federal level, but at every level of jurisdiction, right down to county planning commissions. There are other windows into the transnational cabal of overlords, but the Epstein scandal cuts straight to the heart of the truth of Glubb's treatise. Here's an example: