Judging by other feedback on places like Goodreads, I’m not sure if people didn’t understand that this book was commentary on the world of Harry Potter, or if that wasn’t enough to carry the story for them. (If the latter—fair!) However, as someone who was reading this as tongue-in-cheek commentary on the HP series, I enjoyed the fact that things happen without explanation or consequences because it felt deliberate.
To me, this is a story about someone who wishes that they could have gotten their Hogwarts letter and is only later realizing that the world created by... she-who-shall not be named... isn’t perfect, but still wants to go back to a time when they didn’t know better. That’s how I read it, and it worked for me. There was also a whole low-key subplot/literary theme about that’s never openly explained in the book but about which I had fan-theories, and I really liked that there were layers to the narrative.