A Constitution that recognizes natural rights is a fundamental requirement.
However, I’ve come to realize that at the end of the day, the Constitution is completely voluntary for the majority in a democracy.
The majority must have good reason to believe that the consequences of not following the Constitution are so horrific that whatever they can vote themselves isn’t worth the backlash.
IMHO, that is the one flaw...no ‘teeth’. But, I suspect, the Founders thought we’d be re-fighting for our Independence WAY before today for all the Rights and Liberty we have lost.