Dogs live a fraction of the time we do, and the harm can be quicker. Coming from decades of raw feeders and all the issues, I think people do need help getting a balanced diet. Of course, in this country our kids aren't fed so well either with diet deficits, fat and sodium and carb excesses. So nope, wasn't saying we need a degree in nutrition to feed our dogs, but we get quite a bit of human nutrition info along the way.... should for our animal pets also. I don't know intuitively what to feed a rabbit or hedgehog or iguana. Not sure why you think taking time to learn how to do it right is nonsense.
For the record, many animals have malnutrition, are overfed, fed the wrong things. The examination of animals in the past weren't the pillars of health either. What animals ate to survive didn't even come close to being what was optimal. They'll happily wolf down feces, however parasite-infested it may be. Survival and healthy aren't the same.
So I don't have issue with commercial food any more than commercial food for people or horses or whatever. I do have issues when, gasp, someone feeds what they are eating at least a few bites and someone acts like you are poisoning your dogs. Variety is the spice of life