Because shotguns never did enough damage to anything to warrant use. To be close enough to use a shotgun, the enemies can basically one hit melee you if its a bigger enemy. Especially if lightswitch is turned on. Why even risk that if it takes 4-5 shotgun blasts before you can kill something?
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Oh yeah Nightfall is somewhere where I don't use my shotgun for sure. I love them in strikes thou, they do enough damage there and enemies don't just onehit kill you.