"So I pose this question: Is there really any need for Dog Experts? Don't we have enough DNA level experience by now and enough Common knowledge..lore if you like to suffice for managing this relationship?"
Common knowledge???? I have seen SOOO many people that have no business; driving, using tools, having children, owning dogs, etc. Yes, the world could use a lot more people with some common knowledge!
It is not a given that because you acquired a dog, that you have some kind of innate, genetic knowledge of proper dog behavior!