Not to mention that East Germany still suffers from economic stigmas that still haven’t gone away 30 years after reunification. It doesn’t get the same kind of investment or attention that West Germany does today.
One fairly high-profile (yet topical) example of this is the top flight of German Football. East German teams rarely even make the German Bundesliga[0], and my understanding is that there’s currently only one Eastern German team in the 20-team league.
0: https://www.theguardian.com/news/datablog/2014/oct/17/west-g...