> I was in Iowa a few years ago, and the food is awful. I don’t think the food in Iowa used to be great “100 years ago before modern factory farming,” etc. I suspect it’s always been awful, and people just don’t care about it very much as long as they get the calories they need.

I've observed the same thing; But my theory is taste in food is shaped by how recently a families lineage transitioned to processed foods and industrialized agricultural practices. e.g. I've observed a deterioration in taste in South Asia over the past 20 years, which I attribute to the same effect.