Nornagest comments on Harry Potter and the Methods of Rationality discussion thread, January 2015, chapter 103 - Less Wrong Discussion
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Comments (173)
If Harry gains access to arbitrarily powerful time travel (That's how I've interpreted your scenario. I apologize if I'm wrong.), doesn't that make the whole plot redundant? Can't Harry just go back to the beginning and tell himself everything?
That's a well-established fanfiction genre, but I think its popularity is actually evidence against its use here.
On the other hand, I don't think I've ever seen a Peggy Sue that ended with the time-travel event rather than starting with it.