This is going to go badly without education, mental health, and other services being govt subsidized as well. You need to not only take care of basic survival but also provide resources for self actualization. Otherwise people will just sit around.

Education, Mental Health, and other services are already government subsidized.

Not enough. Even a person on AVERAGE income struggles to pay for those services. They would be completely out of reach to someone on Basic Income.

First, with UBI, everyone would be on Basic Income, so "someone on Basic Income" doesn't define an income level.

Second, currently, those services -- other than K-12 which is universal and free -- are provided through means-tested non-cash programs. While many proponents of UBI favor it eventually replacing all means tested programs, the San Francisco pilot won't (and can't, because SF can't trump state programs.) So low-income people get support for those not available to average income folks.

I agree with everything you said. I feel like my point still stands. Without additional services freely or cheaply available that allow people to achieve more than just 'survive' I can't imagine any BI experimentations accomplishing anything more than just subsidizing people to sit around.