Vladimir_Nesov comments on Harry Potter and the Methods of Rationality discussion thread, part 18, chapter 87 - Less Wrong
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How do you know that when they're never used for education, and are only ever shown for personal experience? Perhaps they burn in memories effectively, in which case they're a clear win: take the smartest and most skilled student, have them learn something, extract the memory, and mass produce that. Amortize it over thousands of students for indefinite decades... Sounds much better than video.
As far as I recall, we are given no indication that such an advantage over video is present.
The argument from silence works both ways.
Except, we know that they aren't in fact used for education.
In fiction, if something is not foreshadowed, it can be true, but it shouldn't play any role in what follows, and in this sense it could be said to not belong to the fictional setting.