That sounds like a very interesting article! It's funny that you brought up Western Gothic because when I saw this discussion prompt, it made me think that my favorite incest ship was the two sisters in We Have Always Lived in the Castle (which doesn't have canon incest, but does have resistance to patriarchal structures).

IIRC JJWXC doesn't allow it now (if it ever did)?

Huh, this made me realize that I've always assumed there was an incest tag that JJWXC removed, but now I checked, and the tag I was thinking of is just "forbidden love". I assume it must have been used for incest in the past because I saw locked incest novels with the tag, but I don't know if they were allowed or just dodging the censors.