Earlier quoted context omitted.
> UBI would, and should, replace current welfare schemes. It can't. There still needs to be a safety net for people who don't use their UBI to buy food or shelter. And then you're back where we are now - some sort of safety net for people who don't have food or shelter.
That's a much smaller proportion of people than are served by welfare programs, and as a group, they're often not able to access current programs due to mental health issues or lack of knowledge. Some initiatives still need to exist but UBI obviates the need for the majority of them, simplifies the administration, removes bureaucratic expenses, and reduces the "othering" of people who depend on the support the most.
That's still a non-zero need for the administration and overhead of a welfare system.
> Some initiatives still need to exist but UBI obviates the need for the majority of them, simplifies the administration, removes bureaucratic expenses,
How does it remove anything if the other systems still need to exist?
By definition alone, the existing systems still need to exist, only without the economies of scale that they have today.
By the way, I don't think UBI obviates the need for a "majority" of them. It obviates the need for one welfare payment system. The others still need to exist to serve whoever they are serving now.