They aren't underpaid wrt their nominal career level. Many of them definitely are underpaid if you consider their actual experience and what they'd get if they

They aren't underpaid wrt their nominal career level. Many of them definitely are underpaid if you consider their actual experience and what they'd get if they were in the market. That price point can only be established if you can safely change jobs, which on an H1-B you can't.