My theory is that the descendant generations from immigrants to America don't care to modify the family recipes at all, to keep traditions going, and there are

My theory is that the descendant generations from immigrants to America don't care to modify the family recipes at all, to keep traditions going, and there are generally not any outside influences to change this, so the food stays frozen in time from 100-200 years ago. Like, your Irish American neighbors are not going to weigh in with ideas on how to improve or evolve the squash strudel. For what it's worth, Germans from the Bohemian/Sudetengau area make some dishes much the same as Czech. There's no substitute for bread dumplings with pork and sauerkraut! Or plum dumplings the one month in the year the right kind of plums are available. But when you get to other areas of Germany, they all have different ideas about how to make dumplings.