I think this is a personal preference. I always read for pleasure and have almost always read a single book at a time. Books for professional and immediate pr

I think this is a personal preference. I always read for pleasure and have almost always read a single book at a time. Books for professional and immediate practical purposes aside, theoretically I have one fiction and one nonfiction book going at a time, but in practice I switch between them infrequently and usually finish one before switching to the other. I think the author wants to say "read however you like," but he can't help adding, "and this is how you like it, so this is how you should do it," which, even if he's right about a particular person's preferences, is contrary to the message that you shouldn't worry about right and wrong ways to read, or worry about how other people think you should do it.