That's illegal by EU law. German citizens who move from abroad to Germany must be treated the same way as other EU citizens when it comes to social security.
Must or are?
It would have been trivial to abolish them, from a legal and administrative perspective.
And yet from a practical standpoint it was not.
That's incorrect on both counts. Again, you don't have to take my word for it, you are free to read about it yourself.
I did and that's what I found.
You have clearly never read a BBC Have Your Say on F1 lol. But also his first world championship was handed to him.