Without the “kum-bah-yah”, here’s my take:

The US is too large of a country both geographically and by population to be a monoculture that agrees on everything.  People of California should have a different culture than people of Alabama or Montana.  This should be celebrated.

The 10th amendment addresses this by letting the state government have the bulk of the say in your life.  

An ideal situation would be a broad interpretation of 10A.  Then Vivek’s plan to abolish most of the federal government would be implemented.

Then when California thinks reparations are a neat idea, it only affects California taxpayers, they vote with their feet and the state implodes.  (Hypothetically, of course)

But right now there’s a federal backstop and a large federal umbrella that makes the “vote with your feet” less impactful.

If the states had to stand on their own for everything *not* given to the federal government in the constitution, the 50 competing democratic experiments would work best for everyone.