> The author is practically screaming “wouldn’t it be lazy that Harry’s darkside is because he is a horcrux?”
This is completely backwards. Eliezer goes to great lengths to put big clues all over the place that Harry is not a normal 11–year old, with the intent that the reader will _notice_ that something is wrong and try to figure out what it could be. Yes, “Harry is a Horcrux” might feel like an anticlimax, or even a cliche, because that’s how the original books went. But you’re supposed to look even deeper and realize what a horcrux really is. In order to work, a Horcrux has to preserve a copy of the caster’s memories, personality, intentions, etc. What really happened that night in Godric’s Hollow is that Voldemort copied his own memories and personality into the brain of an infant named Harry Potter.
I think it is fair to say that Eliezer is treating this as much like a Fair–Play Mystery as he can, so that it is possible for the user to make correct predictions about the end of the story. Not everyone likes this type of story, but for those who do the game of putting the book down at a certain point so that you can puzzle out the murderer’s identity is a big part of the draw. The “rules” of the Fair–Play Mystery are there to ensure that the author remembers to actually make all the clues available to the reader, that it isn’t always just the butler, etc.
To that end, he has several important scenes that examine the consequences of erasing memories, or adding new ones. The most blatant is when Harry is training with Mr Bester, who has all memory of the training erased after each session. As a result, Mr Bester ends up asking the same questions over and over, and being surprised and troubled by the same revelations each time he reads Harry’s mind. And then of course there is Rita Skeeter, and later Hermione, to hammer the lesson home.
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> I only read 5-6 chapters
So you didn't read it.
As others have mentioned, the first couple of chapters are definitely not the best. But yeah, the book isn't for everyone.
"So I wonder- is this story ACTUALLY teaching people things? Or is it just a way for people who already know some of the material to feel superior to Hariezer’s many foils?"
Actually that's exactly what rubs me wrong about the entire "rationalist community". A lot of it is convoluted ways for people to congratulate themselves how much smarter than everyone else they are.
Especially the first few chapters, because there were more attempts at science explanation in HPMOR's initial chapters.