Someone getting a high salary doesn't signal the country's overall prospect. That might be just a "take" case where that job was supposed to be served by a US citizen.

Any US citizen (or citizens in any country) doesn't want fair competition against immigrants/foreign laborers. They accept immigrants because it (is supposed to) enlarge the pie to share. That's why things like dynamic scoring attempt to capture a bigger picture.

I'm personally skeptical about metrics with a lot of guess work, but I appreciate the effort here. The impact of the immigration is just hard to quantify.