You could argue everything, but I’m pretty sure 99% of those sharing a flat are doing so because they can’t afford a flat for themselves, not because they enjoy the company.

It can also be a matter of preference. I lived alone after moving away from my family for a few years. For someone working long hours, far from home, with a demanding job, there is a particular kind of loneliness at coming home after dark to a cold, quiet home.

I ended up cohabitating with close friends after that for a solid decade, during which I met my wife who also joined us. It can be a wonderful arrangement if you have the right people and everyone is working to look after themselves and each other.