UBI is not a replacement for work - we do have to work under UBI. It just lessens the imminent need of working, affording a lot of people the ability to take more breaks from working to relax and recharge.
I agree that a permanent state of non-work is bad for society, but UBI is not advocating for that at all.
Well, if we don't want to make it permanent, why go for UBI at all, rather than improving unemployment insurance?
IMO, a much better solution would be to segregate subsidized housing between quiet people who are actually trying to study, and the abusers that make such places unlivable.
I agree that a permanent state of non-work is bad for society, but UBI is not advocating for that at all.