> Voluntary job switches are just as easy as U.S. citizens.

Then why did my wife's friends that lost their H-1B jobs have to leave America?

American citizens don't face deportation with job loss.

Also, as a US citizen, I'm free to quit my job anytime I want. If I don't like putting up with my job because of some bullshit my employer pulls, I can easily leave. That is absolutely not the case for sponsored workers.

H-1B workers are stressed out and paranoid about their employment. They'll put up with far more, for far longer, with less compensation.