You're focusing on one macro nutrient. Paleo followers are mindful of what kind of carbohydrates they eat to the point where they will argue to the teeth as to

You're focusing on one macro nutrient. Paleo followers are mindful of what kind of carbohydrates they eat to the point where they will argue to the teeth as to why legumes are somehow not a good form carbohydrate and protein (while vegans would argue the opposite). They also focus on animal fats as a primary source of fat over vegetable oils (olive, coconut, etc), again the opposite of what vegans choose for their fat intake. Deficiencies exist in all diets (as they are, by nature, restrictive), the problem is that the extent of these deficiencies is blown way out of proportion. It is very hard to be truly deficient in a vitamin/mineral/amino acid in the privileged western world, but there are a few diets which do mess this up, and vegan is one of them, particularly iron for women.