If humans only work so that they can live, and wouldn't ever work if they didn't have to - then why do so many of our best inventions and advances come from people who didn't give a toss about profit?

If we have the technological means and capability to reduce employment to 10% - why wouldn't we?

Is it so impossible to imagine a world where people only work when they want to? Where the jobs that "no one would do if they weren't desperate" just pay very well instead?

Also, if you really think every UBI study is fundamentally flawed, feel free to design and run your own. Until then, maybe you could do better than waving a hand and invoking a hypothesis to try and invalidate literally every study that speaks against your claim, lol.