My claim isn't that humans arising is deterministic, it's that niches got filled. With rain forests, something would have filled the primate niche. That someth

My claim isn't that humans arising is deterministic, it's that niches got filled. With rain forests, something would have filled the primate niche. That something might well have become human-like. While humans faced genetic bottlenecks, I'm not sure that affected all primates the same.