I think you do
> Of course this is best case scenario version where AI handles the real work and we can just enjoy the benefits of all this automation.
That's not a best case scenarlo. It's a claim that has no precedent in human history. The technology is unprecedented, sure, but that doesn't mean we can rewrite the rules of human behavior when predicting the future it'll bring.
The industrial revolution brought about the massive inequality of the Gilded Age, and those gains were not socialized but rather concentrated in the hands of the few. Perhaps you do not follow politics as closely as I do.
We are now seeing massive inequality again, due to corporations amassing wealth and political power. Part of what has driven that is the concentrations of wealth brought about by computer technology companies.
The burden of proof is on you to show that the people who profit from automating away all the jobs will change their minds about amassing wealth and power and decide to just start sharing all their stuff with the rest of us.
Explain how this would not lead to an eventual Eloi & Morlocks situation.