These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
What Could Have Been: A truck ton of unused content, from models to story content to an AI difficulty slider to a rain system, remains in the game files. There's a developer video on IGN featuring a sacred island of Artemis, which was scrapped entirely from the published game.