I too, am annoyed and upset by not being able to save books as text, for later reading. This change is not a positive one, it lessens the game, and makes it much less enjoyable and more difficult to play. This is not a good thing.
The ingame interface for reading books is horrible at present, and while it does need a complete rewrite/redesign, I do believe that whatever solution will be reached will not be as suitable as what can be done with text files in a "proper" editor/office program.
If nothing else, having text files stored locally, will allow books to be read when the server is offline, badly lagged, or local internet is down.
I think that a history button to recall previously read books is a great idea, however this system should work from text files, which are stored locally on each player's hard drive.
E.