So Luke has at least read Ella's fanfiction, does that mean that he is also a superfan or does he just read because he likes Ella? Or does he like to be in the know about what's going on in the fandom?
Our writers room headcanon was that Luke’s eventual goal wasn’t to become a writer or creator like Ella or Marina, but to become an executive and eventually, the head of a TV network or studio.
So he would consider it good research / part of his job to be in the know about what’s going on within the show’s fandom generally, but he doesn’t come from a fandom background and he doesn’t see it through the same positive lens that Ella does. For Ella, fandom is a magical thing. For Luke, it’s a useful tool for marketing.
Luke is very utilitarian in his approach to his work / life in general - we imagined he’s a great assistant, but hard to get close to so not too many people would consider him to be a good friend.
As far as why he reads Ella’s fanfic specifically - I think at first it’s out of trollish curiosity, because she’s so different from him and frankly, annoying, and this is one way to annoy her back. Then, idk, I think he secretly enjoys reading it for a number of reasons.