Almaironn

Imo "natural" is a subjective term. You could argue that humans are also a part of nature and all the "unnatural" man-made things are using materials coming from nature, therefore everything is natural. More often than not I see people say something is natural or unnatural as a way of saying they like/dislike it, but as if they were making a statement of fact.

Models, animations and textures aren't "most of the game". Almost every game made by a studio starts out with placeholder assets (sometimes from the marketplace) and artists are hired to make custom ones later on.