Generalized points are shown in book but as a user I/we expect more from a book with gud examples and broad view points of author, which will satisfy the examples given. But author can be taken as a consideration if he or she is newly into this line.
Note:- The points given is only for the book not to the author. The author should take this points in a positive way for his or her next book.
Love to read your next book. Happy writing.