No, but it in general greatly increases the likelihood.
> Secondly, knowledge workers also get diminishing returns from longer hours, potentially with even more dramatic effect.
To their bodies? Or to the work they do?
Because that's the difference, your body only takes that much abuse and then needs to re-charge. Go work a jackhammer for a couple of hours and let's talk about diminishing returns.
> Thirdly, many common non-physical working conditions are also extremely tiring mentally and damaging physically in the long-run.
Sure. Let's talk after you've been hauling garbage for a day, been bent over under an engine hood or any other physically taxing workday. There is nothing that quite compares to being able to sit in a chair and think all day long and push a few buttons to wreck your ligaments, muscles and joints.
> Finally, you're implying that child-care is not physically exhausting.
I think you made that up, I did not imply that at all. As a father of 3 I'm more than aware of how physically exhausting child care is.
> My impression of your response is that it has more slurs than the article, to be honest - just re-inforcing the primacy of manual labour. I have the impression you know what it's like to work long hours in a stressful non-physical environment, so I find that odd.
An my impression of your response is that you would like all of the above to be true, however and for the record: I've done both. I've had a number of very physically intensive jobs when I started my career and to this day I'm grateful every bloody day that my life took a turn for the better and that I don't have to work until I can't stand up straight anymore. Being not the most physically strong person I realize that if I had continued down that path I would have been a physical wreck by now.
Have some respect for the people that do the heavy lifting. And if you're unconvinced: go take a manual labor job for a year or so and re-read your comment here.