NPCs feel simple or stupid
I think that the people in Far Cry Primal feel simple minded or stupid, like many might think people were ages ago. They speak with simple words like "I likes big rock", why wouldn't the speak fluently with nuances just like us now. But I think and there are some serious hypothesis that humans were more resourceful and clever and human are now. They had to be to survive.
I wish the people in Far Cry Primal 2 would not feel stupid cavemen. The cavemen and women weren't like that.