No. the rest of the world doesnt discuss it because it makes the least sense. I gave you examples above. It doesnt make sense to put an Aussie and Canuck in same bracket, neither does it make sense to put a Thai and Japanese in same bracket for whatever data point you want.
Even within India a sikh has nothing in common with naga has nothing in common with Tamils.
Race is an absurd abstract. Why not hair color? or eye color? or eye shape?