Maybe they could also make a button "Publish to world" for the Sim that wrote a book so that you can find books back in libraries and on computers when ordering books as well. This way there is more variety and the books your Sims write have "meaning", since other Sims can buy and/or read them as well through regular means.
This way you could also add your own lore to the world. Like some kind of secret you put in your world that a Sim is investigating and writing a book series about.
I know there is a workaround for this, but this option would be easier and less time consuming.