This section of the book focuses on making your message come through as clearly as possible. In most cases, this can be achieved by being concise.
The average introduction1 for a practical business book is six pages. In this book, it’s two pages. Why? My belief is that the majority of people want a short introduction to get a feel for the book’s style before buying or reading on. I don’t believe anyone will say of this book: “the content was great but it really needed a longer introduction”.
Concise writing achieves the correct reader response in the most efficient manner.
Note: this does not mean that you remove every non-critical word; you are unlikely to persuade a vendor ...