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Sorry to post twice in a row, but here is perhaps more of an explanation of Peterson's thinking.
First of all, he's probably more interested in "getting the shot" than the absolute max sharpness. He is also quite possibly thinking of using film, not digital. So you can't just check the LCD to see if it is all in focus. If you set to f/22 then you can be pretty darn sure that everything will be in focus. If you have stuff in the foreground and background and set f/8 then yeah, lots of time it will all be in focus, but not always, depending on what you do, so you might go develop your film and find out you missed the shot. f/22 is "safer" in this sense, but you lose resolution.
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