I think a fundamental reason is that some people build their identity around the only community they are a part of -- their job. Like, book clubs, political pa

I think a fundamental reason is that some people build their identity around the only community they are a part of -- their job. Like, book clubs, political parties, community centres, sport associations etc used to be the place for that. And work was also a place for that. My parent generation worked at like 3 different employees in their whole career.