I think Op means that the 4 faces look TOO different from each other, they don't look like they are from the same race. So when you pick a particular face it's too easy to tell which one it is. So if I make an Au RA with face 2, everyone will know it's face 2 because the options to make the face a little different are not that varied.
Here's my Aura with face 2, I kinda get it. Which we had more options. Hopefully we will get them in the launch.
https://pbs.twimg.com/media/CDpEjj6WYAI7bL2.png:large