These studies are entirely irrelevant. No one will ever convince any corporation or private owner that they can get more work out of people working less, even if it were true (which I personally highly doubt).

And that is also entirely irrelevant. The relevant question is whether our society can maintain similar levels of good fortune if we all worked less. And the historical evidence is clear: there are many times more workers today, using tools that are monumentally more advanced, than in the 1930s or even 1950s. And yet, we are all required to work just as much as we used to 100+ years ago, while being paid less in real terms.