4chan

I'm not sure what you're talking about then because everything from truck drivers and trains to warehouse workers are being primed to be replaced by automated or AI networked machines. There are very few jobs in that sector not up to be replaced by a machine and most of those are things that require a masters degree in engineering or mathematics and statistics.

Pretty much everything that would be considered an entry level job someone with a high school diploma or GED would have a chance of getting isn't going to be around 10-15 years from now, and those that are will have a high level of competition that anyone not overqualified simply doesn't qualify against anyone else needing a job. What jobs can't be entirely automated or done by a machine are going to have more potential applicants than the company could ever hope to employ, let alone need to.

So yeah, TL;DR if we started UBI now with no strings attached and let people without a desire to work, you're not going to see a drop in productivity or services. The only places that might feel the hurt are the places that exploit that young adults without college degrees willing to work a job for 3-9 months before quitting and finding a new job.