A few main thoughts about H1Bs/immigration generally:

1) A guy I know well who works in a robotics lab as Phd. student at an R1 says there are only two American citizens out of a couple dozen people in his program. IDK this seems like a bad use of our educational resources? Yes I know the foreigners often pay full freight, but they also take a spot.

2) Another guy I know well is on the advisory board for a different engineering Phd. program (same school) and has worked at a big US firm himself for two decades. He says that his employer couldn't function without H1Bs etc. He also said that last Trump Presidency the engineering program he advises saw enrollment fall in half due to the departure of foreign students (I am guessing that is more COVID than Trump, but am not sure the details), he seems to think that this will happen again under Trump.

3) Another guy I know sightly less well is an immigration lawyer for a big national bank, and certainly a lot of the people he brings in are in no way special. Just end up being random personal bankers at branches and stuff. Definitely slotted right into jobs that would in the past have gone into Americans but now go to Nigerians and South Africans and Indians because their English is "good enough" and they are willing to work for $10k-20k less for the same quality employee. Especially since the jobs comes with immigration status. In these type of cases I think there is a crystal clear case this is just straight out harming Americans pretty seriously.

4) Personally I work closely with a tech firm staffed with Indians (and a couple Latinos) that is based in DC, and FWIW their output is hot garbage. Not sure why exactly, but never met a non-Indian or non-Latino working there. I am sure some of them are citizens by now because they have been in the states working for this firm (and/or a couple of its subsidiaries) for over a decade.

But they certainly are not some tiger-children Übermenschen. I mean maybe their employer would be just as much of a mess with more "American" staff, but in this case I am pretty sure it hasn't been a magic ticket to competency. Probably just cheaper. Plus with government contracting you get points for being brown and having brown staff.