Maybe I'm misunderstanding other posters' apparent belief that it would be better for humans to be freed from doing "repetitive," "pointless," jobs. An example given above was, I think, "flipping burgers." I'm really grateful I don't have to work at McDonalds to pay my bills, but TBH, I really enjoy doing repetitive work like mowing the lawn, weedwacking, painting, and hand pulling weeds from my garden. I find it to be meditative and also good exercise to bend over, stand up, lift, carry, push, pull, etc. To me, some of the most menial, repetitive jobs seem to be really important, more important than some higher status white collar jobs, which are often destructive.
I have a Japanese friend who is FIRE. To keep active, meet people, make friends, etc, a couple of years ago she took a full time job working at a concession stand walking distance from her house in a beautiful seaside resort town south of Tokyo. I'm not sure what exactly my friend is serving customers. It might be roasted squid, okonomiyaki, dango, or some other Japanese fast food, but it's basically the equivalent of "flipping burgers" in the US. My friend doesn't need the money from her job, at all, but she says working gives her a sense of humility and of making a positive contribution to the community where she's choosing to live. She enjoys the social stimulation of interacting with customers and coworkers every day.
I think it's great that my friend is happy working at a low-status, menial, repetitive job. To me, and maybe for some others, the ability to do something like that is basically a luxury. Without my friend's passive FIRE income, she could never afford to live the way she does in a HCOL area. In my friend's former high-stress corporate life as a marketing executive, she made tons of money but often didn't feel like she was making a positive contribution to her community and the world, and said she often felt like what she was doing was detrimental. Serving fast food to tourists in a beautiful seaside location is simple and, she says, clearly a positive. The tourists and locals who stop by her concession stand smile, say thank you and are clearly grateful for the menial, repetitive work my friend does, and she's not hurting anyone.
Theoretically, I guess, a UBI could free people who wanted to work at simple, low-stress, repetitive, menial jobs, to do so. I'm skeptical, though, that handing people a UBI check for doing nothing would make their lives better. Maybe in some cases it could work. It just seems like working really hard for years and years, LBYM, saving, investing, and then, after FIRE, choosing to work at a low stress, low status, menial, repetitive job, is very different from being pushed out of the labor market involuntarily and then just handed a check every month, basically to keep unneeded workers from blighting rich people's neighborhoods by living on their sidewalks in a tent...