> Normal, everyday families around the world use processed foods in their cooking

Do you have a source? I really haven't met anyone using cake mixes to make cakes.

But if you mean they use butter instead of milking a cow directly and producing the butter then yes, they use processed food.

It’s a class/geographical thing. In my early childhood in a fancy suburb of a big city, my parents and people in their social circle used mixes 0% of the time, but when we moved to a smaller town it was way more common.