Comment by fasterik

It doesn't seem to me like he is generalizing from his experience and applying it to the general population. He's pushing back on the very specific claim that working fewer hours leads to higher productivity. He admits that this might be true for certain assembly line-type jobs or jobs where someone just wants to collect a paycheck, but it's not necessarily true in the case of knowledge workers who care about what they are working on. I think that applies to a substantial minority of people in developed countries.