I'm under the impression that tech people working in the US on visas are exploited. The end of year review / firing round which is so popular in the US means you can lose your job, which means you lose your visa, and you get something like 4 weeks to land a replacement or have to move out of the country.

At 20? Sure, who cares. If you've got a house, kids in a local school? The level of stress about being abruptly thrown out of the country seems untenable.

I would expect that dynamic to suppress wages for immigrants (as you have fear to keep them in line instead). Healthcare seems to be similarly set up to frighten people into staying in their current employment.

This perspective might not be accurate, but it's why this British engineer is unwilling to move to the US.