For real, I've been seeing "working less increases productivity" articles and headlines for over a decade now. Are these articles wrong, and, if not, why hasn't

For real, I've been seeing "working less increases productivity" articles and headlines for over a decade now. Are these articles wrong, and, if not, why hasn't our efficient capitalist machine moved in to get it done? Looks like it took about 30 years to get the five day workweek from testing to full deployment, with some industries getting it done in 20. But my understanding was that that was a moral crusade. Leaving money on the table while making people's lives worse feels like the kind of thing that should correct more quickly.