I highly recommend you to visit third world countries and sample food from there. I grew up in Burma and have been living in the US for almost 20 years. Every time I went back to Burma, I buy milk, egg and chicken from local markets. I boil the milk and egg, and make curry out of the chicken. The milk is super creamy and if you boil it for 2-3 times, you get like 1-cm creamy foam on top. I tried the same with Costco whole milk, and didn't get as much cream/richness. The chickens are usually smaller, but they don't have "fishy" (for the lack of better way to describe it; but you can notice if you have lived in Burma for a while and came back to the US to eat factory-farmed chicken) smell before/after cooking. The chicken bone is a bit thicker and there is more bone marrow (I like chewing on bones and eating the marrow). Maybe it's the breed difference, but certainly there's no smell.

I'd also recommend you to try different kinds of fresh water fish that are available in places like Burma and Thailand. These fish are more and more difficult (expensive) to buy thanks to overfishing, but the variety and the flavor will just amazes you.

In general, I believe that factory farming has reduced the variety of available food in the US. Whether that impacts the long term health/flavor of the food is something we probably should conduct a long-term scientific study to confirm.

My wife and mom (from the same country) both told me that they cannot eat the chicken from US markets because of the smell, and it took me a while (15 years) to get that distinct scent that they mention and once I starts cooking more and more, I learned to distinguish that myself.