When moving through wreckage - like a badly bombed building - a pistol for at least the guy on point is not a bad idea. Like the post above, there are times when you need a hand to help you move. There are people behind you with heavier weapons.
Also, while not in video games and probably not much of a concern to you, when you go into someone's home or office and are - at least in principle - supposed to be friends, a holstered pistol makes a better impression than an assault rifle slung at the low ready.
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