James P. Hogan wrote about some of these concerns in his 1979 sci-fi novel "The Two Faces of Tomorrow". Sadly the biggest taken-for-granted idea from his novel that now seems fantastical is that governments and engineers cared about AI safety over profit (i.e. the AI developers did not try to privatize most gains while socializing most costs and most risks). From the Goodreads blurb "Midway through the 21st century, an integrated global computer network manages much of the world's affairs. A proposed major software upgrade - an artificial intelligence - will give the system an unprecedented degree of independent decision-making, but serious questions are raised in regard to how much control can safely be given to a non-human intelligence. ..."

You raise a deep issue worthy of a lot of discussion when you say: " A post-scarcity economy is not necessarily an egalitarian one."

Your points also align with my sig: "The biggest challenge of the 21st century is the irony of technologies of abundance in the hands of those still thinking in terms of scarcity."