> you should probably also be concerned with domesticated foods, since those have been selected by their farmers for many generations to produce specific things - bigger fruits, better tasting meats

This is sort of true, but also not at all. Natural selection deals with incremental changes over the course of decades, or generations. The likelihood that, for instance, Omega 3 production will spontaneously arise in a tomato, is so small as to be negligible. GM represents a step-change in capability, closer to the possibilities of the use of industrial food additives, than it is to traditional breeding. Except, as I say, the additives are now an integral part of the ingredients.