@cstross Narrative driven video games have been doing this for decades using human-made content, and I can see where the appeal is (it's not a stand-in for actual friends, it's more like the fantasy of having a particular kind of friend). In fact, I get the impression some people tend to identify with book and movie characters in a similar way.
Oh well, let's see if a random babble generator can replace Baldur's Gate 3. Somehow I'm not concerned.