Auras and locations are functionally different. There are perks that hide your aura like distortion and sole survivor, and hiding in a locker will hide your aura as well. You could also hide your aura by hiding behind another aura, like a generator. The locations are a crucial part of his kit and need to be reliable, and auras would make it too unreliable.
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Except lockers hide auras these days and whatever the legion see goes through everything.