The problem with UBI is it isn't going to address a lot problems around people being unable to work because of physical or mental health issues. You need a welfare system to addresses those issues.

So with higher minimum wage, an unemployment insurance program, and a welfare system, what's the point of UBI? It doesn't fulfill the needs that existing systems do when properly funded and updated for inflation. It's really just a subsidy to companies that don't want to pay their employees well. This is why guys like Andrew Yang want it. And there's a lot of people out there that want it because who doesn't want to get a monthly check from the government? And people are generally attracted to these "one weird trick to fix the economy, economists hate him!" kind of policies.

But the reality is that economics isn't simple, there are no quick fixes. There are people with different needs so there needs to be different programs to fulfill those needs. Someone with a health condition isn't going to survive off of a small amount of money and couch surfing. Someone who has a well paying job and lives in a place that has high rent or mortgage payments then suddenly finds themself unemployed isn't going to be able to pay their bills with UBI.

So UBI is just an excuse to scrap necessary welfare programs, and not raise minimum wage. Couch surfing isn't a solution to housing problems. There's only so many couches and eventually you end up with homelessness.