[brainwad]

No, it's about being able to hire more people at the same hiring bar and comp for companies hiring at scale, like (pre-2022) big tech. If you limit yourself to only hiring Americans in your US office, then you are at a talent disadvantage unless/until you open another office in a more friendly jurisdiction. And if you open such a satellite office and hire there, then that's worse for the US than if you had hired them in the US, because the US misses out on the income tax.

Many other countries have the exact same sorts of visas, because it is good to attract talented, high-paid workers to your country.