> It used to be that if you lost your job as an H1-B, you had 30 days to uproot your life and get out of the US otherwise you'd be in violation of immigration laws.

This is still true, right?

Overall, the only hard requirement of the H1B seems to be "can you hold down a job 100% of the time, until you choose to depart or receive a green card?" It is quite hard to think of other requirements that are possible to implement at scale, but I do wonder.