That is an interesting point and I want to add three cents to it.

Sometimes diasporas preserve the original recipes better than the country of origin. An example of it are some Polish dishes that were preserved closer to the original than in Poland, because when Poland was under USSR occupation there were severe food shortages and some recipes had to evolve or were literally forgotten.

(IIRC that was just a few cakes and pastries, but hey, it still happened!)