Everyone needs to remember a very important thing about the Constitution...
It does not, nor was it ever intended, to stand alone as the only document of law governing the United States.
If it were such, then the Framers would have stopped writing after the Constitution and Bill of Rights were adopted.
But they didn't, they kept writing the US Code, the body of laws that works within the framework of the Constitution.
'The text and meaning of the U.S. Constitution are the same as when it was written and signed.'
No, not really, because the Framers put into place a mechanism by which the Constitution could be amended, as laid out in Article V, and it has been amended numerous times in the past 220 or so years.
The Bill of Rights were, literally, the first amendments to the Constitution as it was written.