You're making the bad assumption that working less hours gets less things done. The author made it clear that he gets more done while working less hours, so it

You're making the bad assumption that working less hours gets less things done. The author made it clear that he gets more done while working less hours, so it follows that people burning the midnight oil for social cred are the real leeches, rather than the people who prioritize better. Also, cranking away on Rails sites isn't going to feed the hungry or give water to the thirsty, by and large. Those are social problems of bad distribution, not lack of productivity.