When canon!Hermione memory charmed her parents she didn't have to take out all fifteen years of their lives that she'd spent with them. Likewise, when Mr. Hat and Cloak erased himself from Blaise's mind he left in all the other stuff Blaise had done between talking to Mr. Hat and Cloak.
Memory charms can be selective. Lucius has time, money, and influence. He can afford to have a trustworthy expert go through Draco's memory and edit out only the events that increased Harry's influences over Draco in a fashion Lucius disapproved of.
You read
"Assuming I survive our hunt for the Horcruxes, I'll find Mum and Dad and lift the enchantment. If I don't... well, I think I've cast a good enough charm to keep them safe and happy. Wendell and Monica Wilkins don't know that they've got a daughter, you see."
as being selective?
The new discussion thread (part 15) is here.
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 82. The previous thread passed 1000 comments as of the time of this writing, and so has long passed 500. Comment in the 13th thread until you read chapter 82.
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.)
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: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13.
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: