> Go to any top STEM PhD program and do a headcount
Having done a STEM PhD, No. STEM PhDs are merely easily exploited labor by STEM departments. The PhDs and postdocs from foreign countries are typically a notch lower than the US PhDs and postdocs (especially the postdocs, because in many foreign countries you can do a 3 year PhD). It's just that most americans won't accept 100 hour workweeks in exchange for a $50k paycheck, and won't falsify the science to stay in pursuit of the next rung on the academic ladder.
Sounds like the bitter words of someone who got pushed out. I know the type, I’m no longer an academic myself. Sorry it didn’t work out for you, not sorry to claim that the overwhelming majority of the most important advancements are still made by people with PhDs, however many unsuccessful ones there are.
You’re full of shit. White American Ph.ds are on average a tier below foreign born ones. I just hired an intern based on AI research academic credentials and out of well over 300 applications I got 3 whole American citizens and they weren’t even in the top 10 in quality.
This is why most ivy Ph.d holders are some kind of Asian. Peter and Paul really are dumber than the alternative on average.
But foreign PhD students and postdocs who are being paid partially in the legal right to reside in the US might well be willing to accept those conditions. Just as an H1B visa tech employee is willing to accept lower wages and less freedom to challenge their employer, or an illegal immigrant farm laborer is willing to accept those working conditions in return for not being in whatever country they illegally immigrated from.
Any justification at all for the US government to give a visa to someone - including student visas, including visas for postdocs doing ostensible research - will be gamed by people whose primary concern is access to the US. Demand for access to the US among the myriad peoples of the world is that strong.