Non-games could also benefit from different books for different use cases.
I once bought some disk utility software because I had a bunch of files that had accidentally been deleted that I really needed to get back (they were not on backup yet because they were recently created) and was quite happy that in addition to the 200 page exhaustive manual there was also a small booklet whose cover said in big print something like "Read this first if you bought this because you are trying to recover a disk".
That booklet was placed so that it would be the first thing you would see when you opened the box and you'd have to remove it to get to the installation floppies.
I once bought some disk utility software because I had a bunch of files that had accidentally been deleted that I really needed to get back (they were not on backup yet because they were recently created) and was quite happy that in addition to the 200 page exhaustive manual there was also a small booklet whose cover said in big print something like "Read this first if you bought this because you are trying to recover a disk".
That booklet was placed so that it would be the first thing you would see when you opened the box and you'd have to remove it to get to the installation floppies.