[parheric]

I don’t think it’s a question of needing anything. Do you need to immigrate to Germany? Or another country for that matter?

No - why do you do it? For upward mobility in a job market that is screaming out for foreign skilled workers.

When that upward mobility is no longer there, why should they stay?

[Schlagbohrer]

There are other reasons such as better quality of life as a working class person, which one can have in many EU countries, but cannot have in the USA.