But that’s not what OP said. OP Made a stupid claim about how only visiting Berlin means one hasn’t really visited Germany.
To your point, my analogy works quite well - If you go to NYC expecting to find the stereotype of cowboys, massive steaks, and barbeque, you’ll be disappointed, because that shit is in Texas.
It’s all relative to how one defines a country’s culture and the lens it creates. Just because someone has myopic expectations does not mean that NYC is less American than anywhere else in the US. The same holds true for Berlin and the rest of Germany.