If Blood Elves want distinct aesthetics, they can lean in harder on the sunwell and holy light, or go back to their roots and expand on fel customization. They literally have two themes already, and technically a third if we’re counting classic WC2 quel’dorei now.
If you want goth elves, the Alliance is waiting for you - red eyes and dark aesthetics would suit the void elves more, and keep the faction divide between the two distinct - which is what so many on GD keep whining about. If you want to play a red eyed undead vampire thing, the Forsaken already exist too, but that’s not good enough because it’s not a sexy elf.
San’layn also failed to join the Horde, and even turned on them. Go do BFA quests on the Alliance.
If the truth about that hurts, then stop gate keeping something as stupid as blonde hair from the Alliance. We don’t get our NPC elves, you don’t either.