Horizon Forbidden West developers describe how the game makes tribes and NPC behavior distinct - Gamepur

Creating a believable space comes from making sure everything in the world from the settlements to the people within them feels deliberately placed.

You’ll find them working out in their settlements, often filled with younger people as older tribe members would be inadequate warriors.

Items that would have just been assets in Zero Dawn for the purposes of giving the impression of a living space have now become usable objects by NPCs.

Interactive NPCs from each tribe will act differently depending on the tribe’s values