I did not list the UK because I was not aware that they also “collected” Germans after the war.

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Dietrich Kuchemann, Riemer Horton, Johanna Weber among others would disagree with you as they worked in the U.K. aero industry after WW2.

I agree that in the west the scientists were more prized than the designer. But not so in the East but that situation was not voluntary, an enforced “milking” whereby they mentored and taught the next generation of Soviet designers, no long term career prospects, but no long holiday in deepest Siberia either.

I understand quite a few German industrialists struggled to bring themselves to voluntarily work in the West even for a fat salary and a new start, probably as a result of patriotic pride.