Before we can speak meaningfully about deficiency and imbalance, we have to first define sufficiency and balance and we need to base our definitions some sort of objective standard of evaluation, preferably one that appeals to the effects of the diet on the general well-being, pathology (or lackthereof in the paleo case), and overall health of the organism.
There is no such thing as a grain or dairy deficiency, only a nutrient deficiency. Likewise, carbohydrates take blood glucose out of homeostasis in a far more profound way than running on mostly fat ever could. And a balanced omega ratio is by definition a balanced eicosanoic state. I'm also pretty sure that auto-immune and toxic (lectins, fructose) damage are not a "balanced" thing.
Your class are douchebags and food pyramids are nutritional advice from farmers and lobbyists.