Restricted solo-flying in germany is a different thing to the US since we have about 15-25000 flights a day during weekends ( and of course in summertime) in mostly in class G airspace in an area having about the size of upstate NY ( don't blame me for geography
) just to give you a clue.
It is still possible but you can expect to end up with your first solo a bit later compared to flying in less congested countries.
I had my first solo after the 6th flight and my FTO is doing the practical training in Croatia where you sometimes end up being the only one on the frequency and I don't believe this would have been the case if I conducted that training in a german based practical training.