This way no one has to worry about work and could strive towards a passion instead of a job. There are arguments against it, that people will turn lazy, but I feel people will always find something to do, it is in our nature. And a world where people do not have to do a 9-5 will free up a lot of room for creatives, academics and inventors to grow in their field
I love the idea of a UBI but one big question comes to mind - what about the jobs that need to be done? Like emergency services, waste collection or jobs that help the country/world run.
If earning an income was no longer a real necessity, and people had the choice if to work or not, I can imagine there would be major problems with the global infrastructure.