Stuff that serves no nutritional value, and is only used to: give them more enticing color, preserve them for longer periods, have them be able to survive frozen, enable lower quality or throw-away animal parts reused, make them more addictive to consumers, make them cheaper, etc.

So...no salt, pretty much no sugar, no smoked meats or cheeses, no cured bacon or smallgoods, no pickles, no jams, jellies, or preserves, no applesauce? After all, those techniques are purely used to "preserve [the food] for longer periods prior to the advent of cheap, universal refrigeration. (And historically, there were no "throw-away" animal parts; we ate everything including the brain, eyes, and lungs. So I'm not really sure what point that's meant to make.)

Your "pragmatic definition" of food additives seems to be "stuff that seems weird to coldtea". That may be pragmatic, but it's not useful.