Writers often express the concern that topic-based writing cannot handle the big picture. Topics, they complain, don’t provide a way to tie everything together. Thus users get lost in a sea of topics, can’t understand the system as a whole, and can’t figure out where to start.
If you formed your topic set by slicing up a book, then the above is probably an accurate picture of the result. Scattered fragments of a book generally don’t do as good a job as the intact book. No wonder that so many writers, having split their books into topics, hurry so quickly to stitch their topics back together into books, leaving themselves, in terms of information delivery, right back where they started from.