
What if they’re Nepali or Bhutanese or Pakistani or Bangladeshi or Sri Lankan or Maldivian? They could speak a Dravidian or an Indo-Aryan or a Tibeto-Burman language. They could be Hindu or Muslim or Buddhist or Christian or even Jewish. Ethnicity and identity is much more complex than appearance or genetics or arbitrarily drawn borders.
Sure, but you know roughly where that person is from and nine times out of ten they will have much more in common culturally with people in the surrounding area than people from the other side of the world. If you shuffle people around too much, they will inevitably lose their sense of identity and there’s many problems that follow from that, on an individual and societal level