Good guess. I'm big on "marketplace of ideas", where each state has far greater control of public policy (which is overwhelmingly federalized right now). If California wants to show the world how good single-payer healthcare and UBI could be, let them. If New York wants to disarm every resident and send police around to confiscate firearms, let them. If Texas wants to ban abortion within the state for residents, let them. Let each state have an opportunity to show the world how good or bad their policy positions are. Diversity of policy + freedom of choice.

My big caveats would be freedom of movement, no criminalizing activity that occurs out of state, free trade, freedom of association (no Alabama, you cannot criminalize trade with Massachusets), etc. If you don't like California, you should be free to leave California (without fear of California retroactively increasing punitive tax enforcement against you), and if you don't like Texas, you should be free to leave Texas (even if just to get an abortion in another state and then come back, without fear of arrest or imprisonment).

We are not one identical set of people with one identical culture, one identical set of values, one identical sense of right and wrong. We're 330,000,000+ unique individuals who cluster together, mainly around people like us.

Good gun laws for rural Montana are not necessarily good gun laws for New York City. We should stop pretending that the people in DC always know best for everyone, everywhere. Local communities know what is best for themselves. The more decentralized, the better.