This is natural, so we use shortcuts as heuristic predictive tools: so the Russians throw numbers at war, the Chinese steal your secrets, the Appalachians are poor, the New Yorkers rude, the Japanese clean and neat. And the San Frannigans bristle at that demonym while they shit themselves in the street.
So, no, the fact that there is complexity and uniqueness in culture is normal. It is not interesting. The only value is what you extract as the weak trendline. Imagine a scatterplot with loads of overlapping red and blue dots, but there are more blue dots above some line than red dots, by a considerable number. Most of them will interact, some red dot may even be higher than any blue dots, but you will be reduced to the fact that blue is higher than red on the graph. It is a weak decisioning tool because the complexity is both incompressible and useless for prediction.