This isn't a requirement, this is a bad choice that one can make. There's no benefit in favoring highly-skilled workers other than that these are the workers that middle-class professionals associate with. The only reason IMO to favor highly-skilled workers in specific fields is to break professional cartels; you don't even have to favor them, just remove the artificial barriers to their employment that have been institutionalized.

> That's a bit of a stretch to think universities are progressive or that they're the ones calling the shots politically.

It's just sucker right-wing pseudo-populism financed by the same people who employ 99.9% of illegal immigrants.

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edit: those people would love to make the process of legal immigration so onerous that only they themselves could navigate it easily, to make laws against illegal immigration so draconian that every undocumented worker was living in constant fear, and to route all enforcement of those laws through an regulatory agency that they have completely captured.