Another point the author doesn't make but probably should is the home economics of DIY: A solo person gets 24h a day, just like everybody else. Ideally 8 are spent asleep. Another 8 (minimum) are probably spent working. That leaves a person 8 hours to do their whole life. It eats away at personal time, it bleeds into work and sleep, often by interrupting or occluding the ability to do either.