To be fair, there was no yellowface involved in ST; they just didn't explain why a Sikh warrior was a white guy.

Original Trek didn't explain why a Sikh warrior was a Latino guy, of course, but the world was younger then.

I do think they could have lampshaded Cumberbatch; there are white Sikhs, after all, and a simple "his family came to India as colonialists and stayed as converts" would have done it.