Oh, definitely, and that does resolve a large class of the problems that people have with H1-B visas! However, it's often a non-trivial choice to go that route

Oh, definitely, and that does resolve a large class of the problems that people have with H1-B visas! However, it's often a non-trivial choice to go that route so it excludes the majority of companies that still want access to talent. As well, even if a company does have such a footprint there are still compelling reasons they could make for wanting to bring that talent stateside long-term (i.e. a particular team is only located in the US).