There is nothing in this game that HC characters would benefit from. The story dungeons and trials are piss easy, you don't go around in the overworld dealing with dangerous areas while leveling, the overworld itself except for the ARR beast tribe quests and some early ARR areas isn't even designed in a way where you can remotely be in danger. HC wouldn't be an experience like in other mmos, or an experience at all, you would just lose your character because an AoE snapshotted you or some random forgot to do a mechanic.