I don’t know what your connection is to engineering, but my wife is an engineer and everyone who works for her is, she isn’t hiring foreign visa holders because it is a pain in the fucking ass. Sometimes bro the sound bites aren’t real.there are roughly 85k total H1B visas total per year. Literally a drop in the bucket. Hiring them is a pain in the ass because you have to show you couldn’t hire an American.
They don’t hand out these visas to engineers. They are given to people who bring exceptional ability to science and engineering, with caveats. Most of my wife’s PH.D cohort who were foreigners(only a few) were required to stay after their Ph.Ds. This was at “The Ivy of the south”, and a top 3 program in the nation. My wife was an NSF fellow, and has pretty mad bona fides in engineering.
ETA: something that is rarely mentioned is that many of the grants that fund research, particularly DOD and DARPA, don’t allow certain people to work on them. DOD and DARPA fund a lot. They funded a huge grant my wife received for her Ph.D in tissue engineering, as it related to the long term treatment of burn related scarring. This is improtant because labs can’t fund research that doesn’t have outside funding. So if a grant excludes foreigners, they can’t take a foreign student.