You overestimate the technical talents the US have in semiconductor. It’s a high bar industry to get in, and you have to work in a lab, wear protective clothing since the lab have to be clean, as opposed to software engineer. High compensation, easier and you could work at home, or finance sector which has been taking talents from every industry of the US because how high the compensation is. You can’t also attract peoples just by raising salary, when the location they’re relocating might not conform their taste