The next discussion thread 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 84. The previous thread has passed 500 comments. Comment in the 14th thread until you read chapter 84.
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, 14.
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:
You do not need to rot13 anything about HP:MoR or the original Harry Potter series unless you are posting insider information from Eliezer Yudkowsky which is not supposed to be publicly available (which includes public statements by Eliezer that have been retracted).
If there is evidence for X in MOR and/or canon then it’s fine to post about X without rot13, even if you also have heard privately from Eliezer that X is true. But you should not post that “Eliezer said X is true” unless you use rot13.
Maybe it's not that wands are needed to cast spells, but that they amplify magical power (and perhaps adds focus to a target). While the magically powerful are able to cast high level wandless magic, most are unable to. Hence, they have to use wands to make their spells powerful enough to have an effect. Children have spontaneous magic but they can't cast as much as adults normally can with wands.
Perhaps Roger Bacon just wasn't magically powerful. -shrugs- Not all great thinkers have to have tons of strength. Er, wasn't he Muggleborn? If the "Muggleborns-are-weaker" theory is true, then it makes sense.
My hypothesis for the reason why high-level wizards continue to use wands is that they've simply grown dependent. If they've been using magic-amplifying wands ever since they were eleven, then they would be used to being assisted by the wand. I think this matches my mental model of Quirrell, who is seen doing a lot of wandless magic (stopping spells midair, spontaneously combusting inkwells). He seems like the kind of person that would train himself to use his wand as little as possible. And even if he can't duel without, his magical ability is certainly very impressive.
However, the spells they do cast are fully as powerful as those of adults with wands.
Pretty sure this theory has been unambiguously dismissed both in canon and in MoR.
Otherwise your hypothesis is credible, though I still don't accept it as I can't see all the high-level wizards we know being dependent on wands when there are so many advantages to wandless magic (and when high-level wizards tend to be ones with strong, independent personalities).