Metal's heart, when it was honest, was anti-fashion and nomadic, not an entrenched culture with a fashion. You're not supposed to come at it from the outside. You ought to find yourself in it. Honesty is never fashionable.
Long hair and tattoos will never really be fashionable, even if some people see it as a fashionable ideal in their own little sub-cultural corner. If they're in it for the fashion, they might end up looking the same as a Hessian but they will be living their lives in a peculiar middle ground between an ideal they want to live and the normal life they should be living if they weren't being pretentious as fuck but are instead failing at due to interference from their fashion pretense. The honest Hessian has no such problem. When an honest genre is new, the pretentious doppelgangers don't exist, so there's no chance of being fooled and optimism runs rampant across all circles. When the genre gets old, the imitators appear. The honest folk wont be fooled. The imitators don't mean much to them. However, the public wont be able to tell the difference between truth and lies. They aren't the artists, they don't have access to the generation side of things, only to what things look like coming from the other side. They get all the representation, but might be lacking in apprehension of the nature of the will behind it. That was of course already a problem anyway, already something to thematize and express in art. Even for those that do feel the force behind the music, all new music will be automatically accompanied by doubt. Our present condition: we love the old classics, but we are presently sick of metal. Anything within its confines seems superfluous and capable of being an aspect of corruption. The truths must be kept healthy, they must be dressed anew, a new work must be written. Why write Hamlet over and over, find a new vessel for truth. The genre is a collected work, there is no point repeating it over and over once it's finished.
Since the existence of imitators fucks public perception generally, it fucks over the audience for the music. Suddenly you can't reach your audience with your art anymore by playing the same style. No matter how honest you are, there is doubt and confusion on the other end. The representations are fucked. Any form of recognition is warped. The need to effectively reach an audience will also push metal beyond its old masks. Averse Sefira are correct about honesty, but it's over for black metal. An honest creative calling shouldn't tell one to repeat the style of black metal to deliver artistic truths. There's no point saying the same thing the same way. Say the same thing in a new way.
If we're talking about individual-focused expression, then who fuckin' cares of course. Do what you want. Do what makes you happy.