If a feature was added to the game, (maybe a tab in settings, or a DLC) that made it so you needed to eat food, and drink water, that might create a more engaging survival aspect of the game.
In fact, it could be more than just food and water. Flashlights could need new batteries after a while, (and the new ones could be crafted/scavenged) you could reinforce certain parts of your safe house with other recourses, etc.
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