idk if this is controversial or not, but I really like when non-professional writing like fic has hints of author bleedthrough when it comes to like, what different people assume is common knowledge. Like sometimes I’ll be reading a fic and it’ll just be obvious that the person writing it is either obsessed with medicine or has been to medical school, because they’ll use terms that are just a shade too technical without explaining them. It’s never the super specific stuff that they’d know other people are unaware of, it’s always the things that once you’ve known it for a while you forget it’s niche knowledge. It’s fun because as a fanfic reader it reminds me of how this is a fun hobby community, where everyone has their own thing going on outside of fandom. Everyone’s got their own specialties and they can’t help but write that into their work sometimes