> It assumes an even production of all goods that people might need, but there isn't, you are giving everyone fiat currency that is not inherently tied to any physical good.

Is what you're saying that since UBI would disconnect someone's production from their income, then this will cause shortages of goods? I think UBI only works if the income generated by it is tied to production. That production would not be generated by human labor, but instead by robot labor. I think if you disconnect that then the system would not work, but why would you need to?