The idea of libraries is interesting. Along with stories of great feats of glorious people, there can be spells, how to cast them, brewing potions, food recipes, and even made-up stories. There could already be books starting in the libraries to start off with, but players writing new stories can add stories into the library once approved by the librarian. Now, how do we standardize what librarians are to look for in order to take out some books, and how are we to deal with corruption?
As for automatic diaries, it is an interesting idea. It could be used to take notes, say what you have done, money you earned, monsters you killed, quests to go \'questing\' on, and more. I would add to this idea with the ability to write in the diaries yourself, and the ability to turn on/off the autmatic diaries.
I have answered my question about wizards writing about warriors. They don\'t. They write about other things, like beliefs on how the world was created, why things happen, spells and how to cast them, and so on.