I don't follow that "Most Qualified" would mean 95% of jobs going to foreigners. I get that the U.S. is 4-5% of the world's population, but if I live in San Antonio, Texas, the pool of plumbers for my house must also live in San Antonio, Texas, meaning that 99.9+% of the world is not remotely qualified for the job.

I mean, this debate is about immigration, right? So current location doesn't super matter, assuming you can amortize the cost of relocating a plumber across several years' worth of plumbing work.