It's been a few years but my recollection is something like:
1. The jobs that are crappy enough for jobs programs are not useful jobs to be done anyway.
2. The overhead involved in having a job (Transportation, childcare, all kinds of second-order negatives on your life) can easily outweigh shitty salaries. Also jobs programs would be worse for people with kids, unless you add more child tax credit to prop up that side of the stool.
3. Having a job takes away free time that otherwise could be used for training or education. Planting trees by hand in the sun is not going to look like anything on anyone's resume. You could put another leg on the stool by having a college grant program or something, but it's another step away from jobs and towards UBI
If you're going to pay people to do something pointless, maybe just pay them to exist anyway?
Why do they have to be crappy? Why wouldn't childcare be a job in the jobs program? Or teaching? or driver? Scott Alexander doesn't think deeply or fully address that in that piece, choosing instead to use a strawman to say it just won't work, but less critically that UBI somehow magically would.
Would you be willing to trust your child to the care of someone who is unwilling or incapable of finding work outside the jobs program?
For any useful job you can think of, ask yourself: What's stopping the unemployed from doing that job right now? They could already be making decent money driving or caring, so why aren't they?
I'm less worried about the current unemployed; that's a whole other can of worms. I'm more worried concerned about a supposed AI job-pocalypse where everyone (including me) can't find a job because AI robots can perform the role I currently perform, for cheaper, and tirelessly.
For the jobs that immediately come to mind, the reason there's no one working then is because I don't have the money to pay for them. I'd love to have a driver and a carer; There's a number of businesses I want to start but I don't have the money to hire people to do things so they limp along with the time and effort I'm able to give them after my main job.
It's been a few years but my recollection is something like:
1. The jobs that are crappy enough for jobs programs are not useful jobs to be done anyway.
2. The overhead involved in having a job (Transportation, childcare, all kinds of second-order negatives on your life) can easily outweigh shitty salaries. Also jobs programs would be worse for people with kids, unless you add more child tax credit to prop up that side of the stool.
3. Having a job takes away free time that otherwise could be used for training or education. Planting trees by hand in the sun is not going to look like anything on anyone's resume. You could put another leg on the stool by having a college grant program or something, but it's another step away from jobs and towards UBI
If you're going to pay people to do something pointless, maybe just pay them to exist anyway?