Big tech is largely staffed by people they "imported" for the job (don't mean that in a bad way, as it includes me). Why pay to get H1B and shipping for someon

Big tech is largely staffed by people they "imported" for the job (don't mean that in a bad way, as it includes me). Why pay to get H1B and shipping for someone from India when you can just hire that same person in place and not only save on that, but also salary? Offshoring in my experience does not usually work on an individual basis.