Oh, by the way, I don’t actually agree with Montagna, and we had some good conversations about this subject years ago.
See, the medication “Accutane” was used summarily to “cure” acne. It works great, but the side effects are intense. The medication is still utilized, but must be very closely monitored.
One “intentional” side effect was to completely shut down the sebaceous glands (and thus eliminate the acne). The result was incredibly dry skin that was nasty. So, my point was that skin without the natural lubricant “sebum” is nearly intolerable.
Anyway, Montagna agreed with me … sort of. Remember, science is all about inquiry … it’s NOT about fixed ideas. All ideas are challenged. That’s the nature of the enterprise.
(You know what? We all still debate “why we have hair” too. Universally, people in all cultures don’t like hair in the “wrong places.” I find this extremely intriguing.)