This fascinates me so I'd really like to hear more! Do you have
any idea what might be the difference in this situation compared to other places?
Just off the top of my head one thing that comes to mind is that age might play a role. I've noticed that making new friends in a new place has been more difficult since I entered my thirties.
Another could definitely be culture. While I believe almost every city beyond a certain size will have 'pockets' of particular types of people, and thus that it should be possible to make friends anywhere, I've definitely found that in some places my kind of crowd is kind of 'hidden' within the more popular culture(s). This seems to be more an issue in smaller cities, but still.