Yeah. But I think if you watch “The Devil Wears Prada” you will see that Andy’s friends are (mostly) confined to her thread, so it’s not just throw away characters. Andy’s throughline is something like, “young and getting first job” and that defines her friends to a tee. They work to reflect her problems, but don’t have an OS function as far as I can tell.
I’m sure there is a story where the IC is an old journal, too, or a stack of letters – hard for that to be concerned about much in the OS.