Source: I’m an immigrant. I ended up in Canada for unrelated reasons, but the system in Canada is much better. Tough, but fair, mostly transparent, and even kind in some ways. In the US it’s so byzantine by comparison.
Which is what the person you are replying to meant anyway.
I am an immigrant myself (not in the US), the only paper I needed was a work contract. After a year of working I got permanent residence with no further requirements attached, it's no longer tied to having a work contract.
From my limited knowledge Canada and Germany have much more rational immigration systems.
Japan also had the second largest economy for decades and a very tight immigration system. China will overtake the US on economy soon if it hasn't already and they have very tight immigration also.
We also overproduce PhDs right now and elite-overproduction is something that seems to be very destabilizing.