The problem I've always had when "job guarantees" come up is what about those that can't work? Be it from disability, age, or something else. Would we also need

The problem I've always had when "job guarantees" come up is what about those that can't work? Be it from disability, age, or something else. Would we also need a separate welfare system in place for these people? If so why not just have one system like basic income that provides for everyone. The other problem I have is that these are most likely to be busy work jobs. With something like basic income you could spend your time doing whatever you want. Anything from nothing, to art, to working for a company. I don't know if basic income has any major downsides (I'm not an economist by any means), but to me guaranteed jobs seem like a worse alternative.