The truth, of course, is that those rockstars account for a very, very small portion of the sought after visas. The vast majority of the allocations are for average professionals at companies far from the bleeding edge.
It seems odd to me that we would put in such an effort to import average workers when there is both not an insignificant number of unemployed American tech workers, and a large number of tech-educated American workers pursuing other vocations. This smells more like a failure of employers to lure the workers they need than of a true shortage.
I do think top companies should be able to scout internationally for top talent and bring them back to live and work in the country. But top talent demands top dollar, so there needs to be a bar. A company must be willing to pay them significantly more than their position's average salary. If they're the best of the best, they're worth it.
To stick with the soccer analogy, how much more do you think someone like Lionel Messi gets paid than a junior league player, or even an average pro player? It's understood in sports that you must pay top dollar to get top talent. I don't think it's too much to expect industry to do the same.