It would make the game-world feel more lived in if there was wildlife as well as ally npcs wandering around the patrol zones that could fight enemies, give out quests or whatever.
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So in Other words - Space Skyrim. I mean, I would like to buy Spacehorse Armor with my 4,000 odd Baryon Boughs I have. Also, Skooma. Not even once. If you have the coin, i have the wares.