The option to hide the helmet on your Guardian, is that something which has been spoken of by Bungie or at least the Community?
I'm probably not alone when I say that I enjoy to put time into my characters cosmetics, but it's all a waste of time with all these full-cover helmets. I really love the armor desing in generall in Destiny, but options is alwas nice.
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A helmet that isn't covering your dome will not stop your enemies from painting the walls the colour of your brains.