@Wes Blackwell - thanks for a well organized post and starting an interesting thread!
My .02: I agree with the historical data that new technology will not create legions of unemployed - new jobs will arise. AI is a non-issue in terms of employment over the longer term. There will of course be localized and short term disruptions, but new options will evolve.
UBI is detrimental to individual development - I would rather see that money spent on free education, improved physical and electronic infrastructure, drug rehabilitation, financial counseling, and other systems that empower people by creating a supportive framework for them to improve their lives themselves. When people who already have life management issues get more money, they tend not to use it effectively to improve their situations. A more supportive society would provide free higher education for those who want it, giving those born without wealth the chance and incentive to improve their situation. Better infrastructure would make our country more competitive, speed up innovation and commerce. Drug rehabilitation and financial counseling are needed for those who already have issues and need help to learn better life skills and problem solving.
As one poster noted, many adults are just "big children". For whatever reason they didn't learn needed life skills from their parents or society. What is needed is good education and economic laddering, not freebie handouts without any considerations or consequences.
Also, the inflationary effect of UBI would in the end negate the impact, especially for the middle class who would bear the brunt of the tax burden, further weakening economic equality and widening the economic gap. Any taxes imposed on business would be passed on to the consumer via higher prices. The inflationary effect would impact all assets, including real estate. While there might be some good times short term, within a few years it would zero out. For the most part, "there's no such thing as a free lunch", though of course there are exceptions to every rule. But talking about the overall condition of millions of people, that would hold true.