Eliezer wrote a story set in the world of Harry Potter because Rowling didn't think very hard about the implications of her worldbuilding and created a massively exploitable setting.
I don't think "didn't think very hard" get's to the point. She simply wanted to paint a strange world and didn't care.
In some cases, she cared later, and had to work her way around what she'd done.
EDIT: The main example below is WRONG, but you can read on anyway if you want to know what I thought and why I thought it.
A simple but revealing example: If you just read Philosopher's Stone, there is no indication that the Wizarding world is meant to be secret. When Petunia recalls the arrival of Lily's letter, there is no sign that anybody is surprised. The Evans parents are proud, and Petunia is disgusted, but they all think that they know what it means to be a Witch; the...
This is a new thread to discuss Eliezer Yudkowsky’s Harry Potter and the Methods of Rationality and anything related to it. This thread is intended for discussing chapter 110.
There is a site dedicated to the story at hpmor.com, which is now the place to go to find the authors notes and all sorts of other goodies. AdeleneDawner has kept an archive of Author’s Notes. (This goes up to the notes for chapter 76, and is now not updating. The authors notes from chapter 77 onwards are on hpmor.com.)
Spoiler Warning: this thread is full of spoilers. With few exceptions, spoilers for MOR and canon are fair game to post, without warning or rot13. More specifically: