Yes, I agree, of course there can be those kinds of patological skin conditions. Those are extremes though. Most people with oily skin are perfectly alright and are just an example of natural variation in genetics. I don't want every person with oily skin to think there's something wrong with them. But they ARE in greater risk of developing a skin condition if they don't adopt hygiene appropriate for their skin type, so advises not to use soap or shampoo can be very bad for them (and good for the dry type of skin people at the same time).