It is not a matter of too much polish, but actually a form of laziness. In bygone decades we would have expected, absolutely to see a white person play an indian because we were involved in an active, aggressive campaign to block indian memes from our memepool. A pet lizard doesn't have to keep up to the environment. It has everything provided. It just sits on its branch and waits to be fed.
Animals have very low needs to handle abstraction.
They are, as a result, significantly less complex responders than other human beings. No that is just recognizing and reacting. That landscape of ideas does not have the dangerous fluidity of man made abstractions. You have a picture in your head of me. You can here your version of my voice as you read this.