Saying that China or India are not "diverse" seems to assume that all Chinese people are actually members of the same group simply because they're all "Chinese

Saying that China or India are not "diverse" seems to assume that all Chinese people are actually members of the same group simply because they're all "Chinese people". (China recognizes 55 ethnic minorities, and the Han majority itself speaks several mutually unintelligible languages although they kind of just ignore that.)