We already have food stamps, WIC, EBT, Welfare, and other gov 'basic living' type programs.
The only difference between those and UBI is that UBI doesn't have 'Welfare Ceiling' trap, and is available to everyone once they are 18, unlike WIC and food stamps, which are another part of the 'Welfare Ceiling' trap which incentivizes staying in 'comfortable/livable' poverty indefinitely.
UBI is not a perfect solutions to our issues, but it does streamline the existing 'basic rights' bureaucracy that is now split between multiple agencies/depts and removes a lot of bureacractic waste from the process.
This is a blind spot a lot on the Right have; they keep thinking that the changing nature of society, jobs, the internet, and automation means can just be ignored in favor of 'old fashioned' ideas that are out of step with political, economic, social, and cultural realities in the US these days.