The number of hours a person works does not indicate their productivity.

Going with a half-yes here. Some jobs are number/availability dependent: i.e. customer support. I still believe that with all the technological advances that have happened in the last 100 years it's crazy that we're still setting 8-hour workdays as the benchmark for that though. In a perfect world, work would not be measured by hours but by results. We could then measure overall average time commitment on a yearly basis to set reasonable hours for service jobs, corporate CS roles, and other careers that require direct availability. Accessibility and change for these types of careers are also needed so they are not left behind in the culture shift i.e. imagine this is adopted across marketing or engineering verticals (which often require less direct availability), but then for CS roles, people are still expected to work 8 hours, which wouldn't be very fair.

absolutely agree that we should be doing deep / focused work. that this will lead to better results, but even in the season it may not, it still produces a richer outcome regardless of how long it takes to see the work come to "productized" fruition.

couldn't agree more

completely agree with this