I think there are many jobs Americans have decided the just don’t want to do - at a large scale. That said many do.
There is a completely different dynamic with job shops like wipro and others sponsoring “high skilled visas” which are only used to undercut certain labor markets.
Whoa there. What's wrong with "undercutting labor markets"? Last I heard, when a profession (e.g. doctors) decides to limit the number of practicioners in order to charge a higher price to the public, that's a bad thing. It benefits the people currently employed in that profession now, but it hurts others who wants to join, and it hurts the public who wants to get the service (e.g. healthcare). The sum of hurt is greater than the sum of help. Cartels are harmful; they don't stop being harmful just because there are borders involved.
I mean, it's one thing if you think immigrants commit more crimes or use more taxpayer money. These are both false, but at least the argument could hypothetically work. But if you say that even perfectly law-abiding, non-welfare-using, good-work-performing hypothetical immigrants shouldn't be allowed in because they would "undercut labor markets", that's plain nonsense. Such nice hypothetical immigrants should be invited in large numbers and everyone would win from it.
I'm not against tightening up the constraints to prevent what becomes indentured servitude dressed up in red, white, and blue. That doesn't help the American people or those who carry within them the American dream. But fixing that is not everyone's actual intent, and that does really bother me.