In the past, the concept of balance in food was introduced for feeding dogs. Balance is something that humans seem to have an innate need for. Chaos is bad and must be balanced. The feeling of chaos is also inherently related to ignorance.
There are a few eternal memes in dog feeding. Chicken bones kill, the dog is an omnivore, or the calcium to phosphorus ratio is the most important thing. None of those are true. The belief in the high phosphorus content of meat is also not true.
Phosphorus (P) is the second most common mineral in the body, but it can be confidently called the most common mineral in nutrition. Phosphorus is everywhere, and it is impossible to find food that does not contain phosphorus.