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Fellow transplant here, if anything the US immigration system actively discourages people with options (smart folks who can focus and work hard for 5-7 years) from coming to the US. What brings/keeps them here is the network effect. This is sad, because the immigration system is immune to any feedback because of this fact. Namely their actions don't have any consequences. The system is a parasite, it has so far managed to thrive without killing its host. Either that continues indefinitely, or I really hope another center of knowledge puts pressure or better yet totally kills the US immigration parasite.