If UBI helps people do useful things like caregiving or job training, then it has achieved something.
If UBI just causes less (useful) work to get done, then it is a net harm to society.
Maybe it's good if it shifts investment towards automation that eventually improves productivity. For example, if paying Uber drivers becomes less attractive, maybe researching self-driving or investing in mass transit becomes more attractive; maybe that's good.
But things still need to get done, and money by itself doesn't do anything. In the extreme case you end up like Kuwait, where citizens get (in that case oil) UBI, and guest workers outside the UBI system do all the actual work.
The US could do that, and it might reduce inequality among US citizens, but new outgroups would become painfully apparent.
I suspect this instead leads to companies determining "nobody is willing to work at the prices we're happy to pay. Therefore there is a labour shortage; we need more immigrants, and we're happy enough to sponser them for a time"
Note they don't raise prices, they instead increase the applicant pool.
Boss makes a dollar, I make a dime, that's why I shit on company time. If I got paid fairly and had a seat at the table for discussions about profit sharing then I would plan my shits to not impede my work. Until then, big capital can keep blowing their hot air, workers don't care what these suits think and are realizing the suits don't even care about the health of safety of the workers themselves, let alone their ability to afford a family or house.