I don't think there is any reasonable evidence to suggest that most workers here on H1-B visas make more than 150k median salary, much less that they are awarded similar options as other employees.
I'm glad to hear this has been the environment you've worked in, but I don't believe it reflects the majority of skilled workers in the US on H1-B.
If this is public information, I'd love to know what the median salary is rather than taking your word for it on a specific area I am not familiar with.
Level 4 is also described as "This is the fully competent wage level. It is for anyone who have sufficient experience to plan and do work that requires judgement and do independent evaluation, selection, modification and skills. Usually these roles would have management or supervisory responsibilities."
Do you think that the median "Software" developer being brought over on a H1-B is Level 4? Even if you think a large number of them are L4, do you see the issue with trying to exceed a median salary at 150k if the L1 is 117k and the L4 (management or supervisory) is only 212k ... and we're using data from one of the most expensive corners of the US?
Even inside the tech industry, H1-B positions are often paid much lower than others within the company (even before benefits are considered).
$150,000 median yearly salary would mean H1-B positions are taking home 10k a month. I've worked with too many people in these positions to believe they're being paid reasonable wages - unless you have an extremely in-demand skillset, H1-B holders are often treated like indentured servants by huge companies/teams.
I'm glad to hear this has been the environment you've worked in, but I don't believe it reflects the majority of skilled workers in the US on H1-B.