If these people have not defrauded the US then they would not know what to do with a work visa as they'd be hurrying back home as soon as they received their diploma, pulled by those strong ties and the desire to finally put the education to use at home.
But me personally, I advocate many fewer student visas.
Again, these are the most talented, most affluent minds that China has to offer. Sure, let’s have them work for the CCP rather than keeping them in the west.