The IA has tried distributing their stores, but nowhere near enough people actually put their storage where their mouths are.
* What is a "bird famine", and did one happen in 1880?
* Did any astrologer ever claim that the constellations "remember" the areas of the sky, and hence zodiac signs, that they belonged to in ancient times before precession shifted them around?
* Who first said "psychology is pulling habits out of rats", and in what context? (That one's on Wikiquote now, but only because I put it there after research on IA.)
Or consider the recently rediscovered Bram Stoker short story. That was found in an actual library, but only because the library kept copies of old Irish newspapers instead of lining cupboards with them.
The necessary documents to answer highly specific questions are very boring, and nobody has any reason to like them.
Sort of like the bittorrent algorithm that favors retrieving and sharing the least-available chunks if you haven't assigned any priority to certain parts.