The opposite claim 'humans are okay lackin meaningful work' also needs a citation, as its easily demonstrably false in history.

Contrary to popular belief our civilization is not the only one that has come close to being able to provide basically all its needs. Many other civilizations have and eventually the class whose needs are provided for disintegrates due to their own decay. We will make claims that the 'barbarians' sacked rome, and while this is technically true, they are not the reason for the decline of the Roman Empire. The truth is, by the time the barbarians attacked, rome was a shell of its former self. In times past, the Roman army would have put an end to the barbarians. But the societal decay from the elites of the empire meant the systems that preserved them there slowly fell into disrepair.

Broadly speaking we are witnessing the same thing now except at a grander scale because now even for the lower classes it's not obvious they need to work.