The aversion to housemates represents a breakdown in social trust in general, plus people are just more precarious. You’ve got to hope your housemates can pay rent when all of you hold tenuous employment. One person losing their job is a disaster for everyone else. One person moving out can also be a crisis.
I lived with housemates around 2010 to 2016 and it was a constant struggle to keep bills paid, plus we’d have to share vehicles and that was difficult since sometimes one of us would work nights, some of us days. Also revolving door of girlfriends/boyfriends who’d come in and eat our food or borrow cars.
Not great experiences. Honestly some fun times looking back on it all. Was nice to be around friends or do movie nights. But otherwise it was a struggle to keep together.