Why would you say this in time when people are getting laid off left and right? We need to provide jobs for everyone who is already here. The F visa is a non-immigration visa to begin with.

Additionally, we need to deal with people who come to our country and then only exclusively hire people from their country of origin. I can point to the page of multiple Chinese professors in the US who were trained by Americans in American universities, then start their own labs in American universities and only hire Chinese graduate students (and I’m not talking about labs of 2 students, I’m talking about massive labs of 15 - 20 students). Out country is getting taken advantage of and the last thing we need to do is give away more visas.

This is a problem in US tech companies too. I've seen many instances of teams being run as ethnic enclaves. In a company that is 50% American nationals, what are the chances that a set of three or four teams under one man would have a total of 30 out of 30 Chinese nationals by pure happenstance?

If the other half of the company were Chinese nationals (which certainly isn't the case) a team of 30 by pure happenstance would be 0.5^30 = 9.3 * 10^-10. Real fucking unlikely, yet I've seen that scenario happen more than once. Nobody says anything about it of course, everybody knows how HR would respond.

I know of a large Chinese tech company which has research labs in the U.S. and these research labs are 100% Chinese. They're basically able to bring over whoever they want from overseas. What are the odds that there are ZERO U.S. citizens able to do those jobs? And even if all of these people are also U.S. citizens (I know for a fact they're not because I know some of the people in these labs), what are the odds they all ended up being from one ethnicity?