The UBI (universal basic income) is intended to meet basic needs, it’s not intended to give a lavish life. If you want more than the basic, you need to work a bit for it.
What it would do for work is to make it optional and more flexible. If your employer isn’t paying you enough to be there, you don’t keep working there. You find a different job. You have the security to quit with nothing lined up. Because nobody has to be there to meet their basic needs, employers have to actively make you want to work there for your extra wants to be met.
That means maybe a store clerk gets a discount on goods in addition to their flexible hours per week.
But ultimately a shift to UBI plus socialized housing and socialized healthcare would lead to a shift in society such that we don’t have the bullshit jobs we do now, and a lot more people would probably be happy to do menial society supporting labor as part of a rotation. Idk, frankly I’ve met people, they don’t mind doing grunt work if it’s appreciated and valued.
If my bills were paid and I had to cashier or collect trash 2 days a week to keep society running (and for some extra spending, like for electronics or games or whatever) I would totally do so. It’s not my full time occupation, which makes it infinitely more desirable.
I can’t really capture an entire economic shift in one digestible comment, but a lot of stuff would necessarily change to accommodate this shift. It’s not a business as usual proposal, so you can’t really apply a business as usual mindset to it.