Diversity goes beyond eye and hair colour. Isn't that kind of shallow?
What about face shape, height, body shapes, facial structure, facial features, skin tone etc.
East Asian people do not all look the same. Just because they have dark hair and eyes, does not mean they look the same. If you can't tell the difference, you're just not used to seeing lots of Asians. Even in China, people from different regions have different appearances.
Some East Asians think all white people look the same because of pale skin, big nose, huge "cow eyes" etc. (not my words, but those of Asians I know)
There is more human genetic diversity in Africa than anywhere else, as well as phenotypic diversity.
Diversity goes beyond hair and eye colour.