And what percentage of H-1Bs are these PhDs with groundbreaking research backgrounds? The vast majority of the H-1Bs are hired by a handful of consulting firms (mostly indian) to do mundate SWE/IT jobs that don't require any special skills but a few months of bootcamp.

Also, don't forget that truly exceptional researchers can self-file for green-card using national interest waiver categories: EB1NIW, EB2NIW don't require employee sponsorship.

So, I think your point is moot.

How does the green card solve my problem as an employer? Should I also force them to get married with Americans so that they have better chances of working for me?

I just want to sponsor a visa for a worker of rare qualifications. If they choose to become permanent residents of the US it’s their choice, and frankly none of my business.

The system we have is insane.