Anyway, you're drawing the wrong conclusion - it's astounding how close the US mortality rate is to the Indian, which attests to how good the US system is at operating successfully on more complex, elderly patients. Of course, you could argue that the US has optimised the wrong thing, at great expense...
Is that connected to the extra funding that older people get?
What happens if we compare mortality in people under 65?
Do centres that do more surgery have better outcomes? The answer to this is already a resounding yes. There isn't any doubt about that, it's been shown over and over again for multiple different surgeries within developed countries. Surgeons knows this, and so do health insurance companies. But of course this has to be asymptotic. Doing 1000000 CABGs doesn't make you 1000 times better than the surgeon that does 1000. So I doubt there is any real difference between the surgical skill in Shetty's centre and top institutions in the US. It's an untestable question in any case. The important point is that the care overall seems grossly non-inferior to the US, not that the US is inferior.
The problem is they would become proficient at treating the wrong things. Medical conditions vary greatly by geography. Polio is still alive in the third world, Russia is fighting drug resistant TB, and up thread there is a mention of a surgery performed at a 1000x rate in India compared to the US(Once a decade vs once a day). All the while what affects Americans would be glossed over because it doesn't infect the rest of the world at the same rates.
Also, the 16 hour/day rule is only for interns, IIRC. Resident shifts can go up to 30(?) hours.