I mean here is some evidence https://rawprimal.org/topic/156/evidence . Balanced healthy diet is also imbalanced hypocritically as it doesn't give human all nutrients it needs for proper maintenance, repair and growth. It’s the famous "Imbalanced unhealthy diet".
Well raw primal is too fat heavy and focuses too heavily on certain nutrients compared to that of other more optimal diets that it just makes it illogical to choose it over other diets