But isn't reducing labor costs and increasing shareholder profits the purpose of replacing human workers with robots? What is the goal?

I can't read this article because of paywall. Did Mr Gates explain how people working 2 days/week will be able to support their families? Maybe he favors a universal wage high enough to support a family?

Bret quoting from a letter to the editor that his great grandpa (secretary of his local John Birch society) wrote in 1954.