you are assuming the reality of the world is the same in every part of the world. in Japan, working in an office job often means an hour commute, 8 hour work day, after hours mandatory fun with coworkers, then an hour commute back home. if there is some kind of business crunch and overtime is needed, just fucking sleep at your desk. And for this, no woman will date you, because who literally can? one reason Japan's population is falling is because everyone works to hard, dating is impossible, and marriage is miserable for women.
work like a slave, no free time, shit pay, and no cute wifey to tuck you in to bed. what is the point? Japan is also viciously conformist and rigidly conservative. small wonder that social pressures and lack of pleasure make weaker people crack and just run and hide
and its not like hikkokomori don't know they are leeches and weaklings. they know what people think of them. this is why they hide. you hide to escape the pressure, but hiding is also shameful, so your coping strategy just compounds the pressure. solution: just stay hidden