I very much understand what she is saying about the discreet angle of the stories. Even a detective novel is really just a set of tightly fitting “discreet stories,” all of which may overlap and inter-relate, with the Dick in the center of the overlap, but still each “relationship” is a “discreet relationship.” That is to say that John may know Tom and Tom may know Betty, but John may not know Betty even though Betty’s relationship to the larger set of events is a big motivation for Tom’s theft from John. The detective, though, should eventually come to know them all.
It’s kinda like working a real case, and that’s how I approach writing Detective fiction. Like I was working a real case, only with me at the center of the case-board, rather than the perp, suspect, or UNSUB.
I get her points…
J.K. Rowling plans to write more about Cormoran Strike than Harry Potter

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J.K. Rowling said that she plans to tell the story of Cormoran Strike, the war-veteran detective who stars in her books The Cuckoo’s Calling and The Silkworm, in more than seven novels, outnumbering her Harry Potter books.