It depends on how you look at it. If everybody here came from a multi-ethnic background, ethnicity wouldn't help on this forum given the fact that nobody really has the exact same mixture. However, if you look at it in a broad point of view, ethnicity has more to do with physical similarities than limiting your options by general hair properties alone. Just because your hair properties are the same on Naturally Curly's scale, doesn't mean your hair is just as similar as someone who has a more similar genetic background as you with the same hair properties.