To quote Wendell Berry, "What are people FOR?"

I'm all in on UBI (paid for with sales tax), because everyone has at least a minimal value as cannon fodder and wage suppression (competition) in a mercantilist society. I also think that most of the systems that use various forms of means or credentialist testing only create resentments, so a system that pays everyone the same basic amount eliminates those competitive mindsets.

Then what? In other words, once you do the math and realize that everyone can be fed and sheltered, what do we do with them? What are they supposed to do to establish a sense of self-worth?

Usefulness to place and future.

We have to reverse the concepts of extraction/colonialism that have become "normal" and teach children that their place is their future, and contribution to their own future is measured in more ways than money.

In a society where one dollar = one vote, that dollar always votes for the biggest pile of dollars, not even for the person who owns those dollars: just the pile.

"A corporation is a pile of money to which a group of men swear moral allegiance." -Wendell Berry

Civilization itself (city-based society) is a profitable cheat: It is a system that isolates human beings from the environment that spawned us: deflecting risks and response-abilities off to debts and future people, while devising ways to steal resources from those same future people (including our future selves). This is the basic problem with our blind faith in money and competition (The Invisible Hand Job).

When it comes to humanity's waste products and consumptionism, "We've gone Plaid!"

That's why the UBI needs to be based on sales tax. We have to make it cheaper for people to stay home and create a life instead of buying one at "always low prices" and throwing it in a landfill.