The reason dewikifying is important is because many pages from other projects tend to have a lot of links. Wikipedia in particular encourages very heavy linking in its Manual of Style. With few exceptions, individual wikibooksWikibooks just aren't large enough to justify this (i.e., there won't be a separate chapter on every term), and linking from one wikibookWikibook to another one is generally discouraged, as each book should be self-contained. The reason it works so well on wikipediaWikipedia is that wikipediaWikipedia is essentially one very large book, and actually ''does'' have individual pages about lots of terms used in each article.
While [[red links]] are often intentionally left in place in wikipediaWikipedia articles to suggest that an article needs to be written to describe a certain term, this does not happen on wikibooksWikibooks, because wikibookWikibook modules are not articles: e.g. there's no point in having a link to [[bubble gum]], since it's very unlikely there will ever be a book called [[bubble gum]], and even if there was, it wouldn't be a definition of the term, but rather an entire book on the subject.
