"Then you wouldn't qualify for a Green Card to go and live and work in America like you say for the reasons you state. I don't know what point you are trying to make."

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It's really not that complicated but I'll try to spell it out in simple steps.

I could have an employer offer me a job in the U.S. tomorrow.

Due to political/government restrictions I'd be unable to take it.

I could have an employer offer me a job in Europe tomorrow.

There are currently no political/government restrictions to stop me taking it.

The current consensus is that post Brexit there may well be?

Can you see the point I'm trying to make.