The higher tier engineers come over on a completely different visa. H1B is just a new version of international slave trade but no one wants to admit it because it sounds bad.

I’ve worked with H1B engineers who vary in skill by at least 2 orders of magnitude. Neither of them are eligible for the “completely different visa”. Yet we keep bringing in the dregs because of the lottery system, and they stay around because of the body shops who are just billing head count.