I think it's even better if someone comes to the US, gets some exposure, learn many soft skills and then go back to India, instead of not coming here at all.
I can't speak for how it is in US because I haven't been there. But I really can't think of anything that can be done only in valley but not in India. But yeah again, I can't be so sure, because I have seen the things only from one side.
About soft skills, I felt considerable writing efforts are required here as part of the normal master's degree. I am doing my master's degree in CS here. Even if I am writing a simple report on some project I spend extra hours to think from the reader's perspective. That builds up writing skills. You get constructive feedback if you present something. That builds up the presentation skills. May be this is a personal experience.
I also felt that you start appreciating positive things about your country more but this experience may not be specific to US.