The natural processes ordained by God after the fall include death and disease and sickness. In order for that to happen natural processes will fall short of perfection.. Ahem just like the Bible says.
Yeah, but why the anthropoid primates, and not other primates like gibbons? In fact most animals retain it. Mainly it's just the anthropoid primates that lost it, indicating a common ancestor that was the starting point of the loss, so the capacity to synthesize vitamin C could no longer pass on to any of the branches that followed after, including gorillas, chimpanzees, and humans. It follows a pattern that's telling, and indicates something quite distinct from the notion that each anthropoid primate was a special creation, not related to the rest.
