I don't see how self-awareness makes any sort of difference?
You said:
a neutral interpretation of the facts would've placed at least an equally high probability on someone meddling with his sorting, as on the Hat played its first prank in over 600 years.
But you did not consider that since the Sorting Hat was sentient for the first time in its existence, it would be very likely to do other things for the first time in its existence.
The only relevant special knowledge he has is that the Sorting Hat had some extra ability to appreciate humor at the time of his sorting
Seriously? Harry knows the entirety of his conversation with the Hat, which no one else knows. In that conversation the Hat used all of Harry's knowledge and vocabulary to try to convince him to go to Hufflepuff, Harry obstinately refused, the Hat got pissed at Harry's obstinacy, and then, with Harry demanding to go to Ravenclaw, and the Hat admitting that only Harry's choices can determine where he belongs, the Hat says "You deserve the scary thing I'm about to do to you" and calls out "Slytherin!" and lets Harry stew on that for eight full seconds before calling out "Ravenclaw!"
That is hardly a mere "extra ability to appreciate humor".
the most intelligent and rational character in the fic considers this the simplest/most probable answer
Yes, he does, but he does not have all the information necessary to come to an informed conclusion. Harry does, and so do we. Harry and we are the only ones privy to his conversation with the sentient Sorting Hat.
And when thinking about the above passage on a more "meta" level, if Eliezer had intended us to have any lingering doubts about the Sorting, he would not have have flatly had our protagonist say "Professor Quirrell was wrong," and he certainly would not have gone on to point out, in the very passage you quoted, that Quirrell did not have all the evidence available to him, so as to corroborate his statement.
I know you want this to be a mystery, but there are plenty of other mysteries in this story to wonder about that are far more deserving of your attention than this matter, which was settled many chapters ago.
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 81, which should be published later today. The previous thread passed 400 comments as of the time of this writing, so it will pass 500 comments soon after the next chapter is posted, if not before. I suggest refraining from commenting here until chapter 81 is posted; comment in the 12th thread until you read chapter 81. After chapter 81 is posted, I suggest all discussion of previous guesses be kept here, with links to comments in the previous thread.
There is now 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.) When posted, chapter 81 should appear here.
The first 5 discussion threads are on the main page under the harry_potter tag. Threads 6 and on (including this one) are in the discussion section using its separate tag system. Also: one, two, three, four, five, six, seven, eight,nine, ten, eleven, twelve.
As a reminder, it’s often useful to start your comment by indicating which chapter you are commenting on.
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: