Why would you expect a huge productivity boost when reducing working hours? Isn’t this setting the bar unreasonably high? Heck, isn’t cutting hours and maintain

Why would you expect a huge productivity boost when reducing working hours? Isn’t this setting the bar unreasonably high? Heck, isn’t cutting hours and maintaining output actually a net increase in per hour productivity? Also, why is productivity even the golden standard here? Why can’t we consider the well being of actual people in this discussion?