So in Horizon zero dawn a upcoming game. We have our protagonist fighting giant metal Bulls, velociraptors and Crab things with a bow and arrow. Regardless of whether our brave hero could have actually fought them, they have all manner of robotic wildlife just walking around and abundant metallic resources. However it seems that they are still living in wooden houses, only have leather armour( I have no idea where it came from) and their weapons are also kinda wooden.
How is it possible that humanity has not made progress into using metals? They should have had plenty of time to adapt to this robotic wildlife right?
This does not follow adhere to the game in question. The context is why humanity would not have had better tech if the animals were all robots. The plant life is normal earth like though.