Hi I’m in college rn and I was actually having a similar discussion with my chemistry type major friends. To explain I’ll tell a story: there was apparently a dangerous lab that occurred where they were using 10M-concentration measurement- of a weak acid. A girl got it on her skin and had to strip naked and use the lab shower for 15 minutes. She still got a burn. In soap making, we tend to use 10-16M NaOH, a very strong base, if getting that on your skin would cause a nasty burn-I speak from experience lol-, what would it do to goat milk over hours and hours? A common misconception is that soap additives give all these super duper skin loving properties, but honestly most of them are literally burned away. Even then they exist at around < 1%. Soapqueen has a good breakdown on how certain oils contribute to the end outcome of the soap in terms of lather, cleansing and integrity. I believe most of these are purely cosmetic effects.