Conjecture what would happen if a primate infant did not possess your chosen primate hand features. Answer this question with the survivability of the infant in mind

Where the primate infant did not possess primate hand features, it will not be able to feed itself.  For example, a monkey cannot survive without its grasping hands.  It uses them to feed itself.  So if an infant monkey does not possess the primate hand features, its survival will be greatly hampered.

Explanation:

Ordinarily, primates (including humans) have five fingers on each of their hands and five toes on their feet.   Most primate species have fingernails instead of claws, and they have touch-sensitive pads on each of their digits. The hands and feet of all primates are designed for grasping, with the only exceptions being humans.  Human beings feature deep perceptions that differentiate them from other primates.