The great thing about photography is seeing is believing. Hard to argue something does not look the way it does.The best photographer I know is unaware of any optics theory.
This is what makes photography as a science extremely difficult. It isn't just describing a physical process, but a perceptual/cognitive one as well. DoF is a perceptual quality--it actually does not exist in any absolute sense--if you have a picture and no one sees it, does it have DoF? Photographic systems ultimately are trying to imitate the human visual system. The fact they work so well is pretty amazing, but the limitations are obvious too.