I have mixed feelings on this. There are of course things that aren't explicitly prohibited by workplace policies but are no doubt unacceptable - e.g. discriminating against left-handed employees. But it's still useful to have explicit policies against caste discrimination to make clear that it's unacceptable. On the other hand, as an Indian in a top tech company we're more likely to experience racism than casteism (…
Are you in a caste that's likely to experience discrimination? Or is this widely accepted among people who'd be vulnerable to caste discrimination?
If I went to an orthodox village or town in India, I would likely face discrimination from Brahmins. On the other hand, in educated circles in cosmopolitan cities in India, caste is unlikely to really come up. The one thing that could come up is diet though - in some regions of India, many or even most landlords (including "lower" caste ones) would deny me housing because I cook meat at home and bring non-vegetarian food home. In America, most landlords won't care, but many vegetarian students / residents do insist on vegetarian roommates (likely more because they don't like the smell of meat than due to the religious vegetarian fanaticism that's seen in some parts of India).
Is it possible that dalits (historically untouchables, who constitute something like 2% of Indian-Americans from surveys I've seen) could be discriminated against in top tech companies in America, unlike me? Yeah it's possible. But I'm skeptical, if only because few Indians could tell apart a dalit from someone like me, given the amount of diversity you see in top tech companies - someone from one region of India won't recognize dalit surnames from another region of India. I could, however, see it coming up in some of the less competitive tech companies, where you tend to see more clustering of people from individual regions of India. I have also heard reports (some from friends of friends) of heavy discrimination by more tight-knit ethnic / caste groups in the diaspora that don't tend to work as engineers in tech - e.g. Jatts in the Central Valley or Patels.