Would be a neat idea, right? I mean, Zavala, Ikora, Osiris, Anna, The Stranger, Cayde-6 didn't wear helmets on the campaigns. So what's stopping us for having a toggle, a setting to show our faces in combat zones? Crucible (specially here), Gambit or Strikes.
I remember what you posted on Instagram Bungie and it was actually really cool: Guardians emoting on Titan and Nessus without their helmets.
Make this a reality please, many fashionable guardian will definetly appreciate it :)
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in crucible/PVP, it would provide an advantage by, ironically, masking an individual's otherwise immediately identifiable exotic ability, aka they can hide things like helm of saint 14 helmet to make bubble's surprise blind, or other useful tells like 1-eyed mask, worm-husk crown, etc.