Re: It works..
The near-communism of Star Trek works because of seemingly infinite energy resources, i.e. almost a complete lack of scarcity. Until that point is reached, systems like UBI are going to help a few, but will be abused by many, especially those coming from "developing" countries. In fact, I'm not sure if I could resist such proposal (i.e. live a medicore life with no luxuries and play videogames, watch Netflix, or do whatever else I want all day) myself, being a lazy tw*t.
"Who exactly is going to do these jobs if they can live on a handout from the state?"
The Klingons, of course. It's only for their own good.