The only scenario where the number of pages has any meaning is when the book is meant to be read cover to cover. Otherwise, as is typically the case with dev b

The only scenario where the number of pages has any meaning is when the book is meant to be read cover to cover. Otherwise, as is typically the case with dev books, it's really meant as a reference. It seems to me that the page count is irrelevant is in this case. We should be talking about something like the "useful topics count".