I have a sin to confess. I liked Harry Potter back when the original books came out. The idea of a hidden world of magic behind the mundane and the characters and stories where enticing. But as it went on, it hyperfocused in Harry and the gang VS Voldemort forgetting completely about the rest.
The last straw and what made me ignore forever what J. K. Rowling says and produces was the epilogue of the last Harry Potter Book. Flash forward to Harry and Ginny's child picking the train to Hogwards, while mentioning tons of new characters. Not even a line explaining who is who, nothing. Turns out, she explained all of that on the internet, and her excuse to not including it in the book was that she ran out of space... Like what?! The last book is not the longest by a mile, and the explanations could fit in 2 pages tops. She just got lazy and tried to attract people to the webpages for traffic. Fuck off!
Yes, I am still mad years later. This might also be the reason why I despise crossmedia story BS like FF15.