"I'd give back the following question: why are we rewarding people currently for doing mind-numbing bullshit jobs?"
What the hell does that mean? Nearly everyone's individual work is useless. A fry cook is useless in isolation, a pencil pusher is useless in isolation, even a programmer is useless in isolation. You do not get paid to do work, you get paid to produce value, hence why people can get fired even if they deliver a lot of low quality work. The work you do is useless in isolation, it is the combination of everyone else's work and the system itself that makes certain work valuable. This is why socialist fantasies like UBIs will only ever work if you have a slave force doing the work that needs to be done. The idea that John Doe's individual ability to slap car parts together somehow makes him valuable is what you get wrong. It's John's ability to exchange his ability to fix people's cars that produces value - in other words, John's ability to start a business and exchange work that he knows how to do for other goods and services. The demand and supply of John's ability and the cars that need fixing, provide John's pool of wealth. If Jane knows how to fix cars too, you don't just suddenly start giving her money for doing nothing, just knowing how to fix cars has no value by itself. I don't see why this is so hard to fathom why this UBI will obviously fail unless Germany has an AI work force it's been hiding under its sleeves this entire time. Someone has to do the productive work, and this will only result in musical chairs where no one wants to be the last one with a job. This system rewards people for not doing work, and unless they have a way of filling that gap, at best this will amount to a bunch of already priveleged individuals being paid to just exist, and at worst, those who are late to the party will be forced to fill that gap.