Germany DOES have a shared set of cultural markers. And they've existed since 1683 after the decisive war against the Ottoman Empire in Hungary. Jan Sobieski and Leopold I. are key figures here. There's even a list of those markers in relevant texts.
Mate, I didn’t agree with the anon that said German culture ‘doesn’t exist’. I don’t even know what point he tried to make with “different dialects prove there is no one Germany”.
That shit happens in just about every country. No one would claim China has no culture because it’s made up of areas with nuances and dialects or because it’s current borders might not be the same as X years ago, or that that means foreigners should be able to change China despite the wishes of the Chinese.
Somehow all those arguments just so happen to lead back to this idea that it’s only Europeans that have to throw away their countries and let it be changed by foreign masses.
For those of European descent no place can be home, nothing of ours is worth preserving, everyone else strangely has the right to hold on to their culture, but ours just exists to absord migrants into.