Quoting you again, but I have a rather large group of friends from the Dominican Republic and I was rather surprised to discover that "claro" skin is more valued than dark or "oscuro" skin, as are features which are more Caucasian or Asian than African.
I once spent an entire (and I mean ENTIRE) afternoon with a friend in a salon in DR, where she had her hair straightened, ironed, stretched, whatever and the stuff they used was STINKY, and it took all day! And when we left she was still not happy that her hair wasn't limp and lank like mine. I wasn't sure what to say (I was really young then) but it made me very aware of how her culture made her feel that the "whiter" she could look, the better.
And as a pasty white outsider (who was so graciously welcomed in the months I lived there), I was very aware of that skin-color hierachy and I felt conspicuous and just awful. (Again, not because of the people, who were warm and accepting: but because I had friends who thought they needed to be lighter to be better.
When you noted your surprise at it only taking a couple of generations to lose all physical Aboriginal appearance, it reminded me of those women in DR who wanted to marry men lighter than them so their babies would be "claro". I will never get why it matters, but that is because I am "white". I can try to understand, but can't.