Well, that was a thing.
I don't think it's a thing I've internalized as canon, though. It didn't feel like reading a HP book. I just wasn't invested in it the way I was with the earlier books. Maybe I got old? Maybe the theatrical medium requires a visual element to properly enliven the characters? (Who'd'a thunk?)
There's a series of thoughts here about fanfiction as a descriptive term versus a stylistic one, but I'm too tired to work them out right now. Note to self - think thinky thoughts later.