I don't see anything spoilerific at all on knowing how bronze is done, it is at best an intellectual curiousity, and such type of information shouldn't be the only motivation for people to engage in conversation with NPCs, pulling people this way into NPCs will always make of them simply as the tools they are now for people to know things and do quests, and not people, not different from those who type /die to read in the death realm without any IC reason. I know it's the players fault, but when gameplay supports roleplay instead of difficulting it, things go easier. Hopefully there is no hype and 0.20 will have a much improved NPC system, but until then, restricting such minimal details and curiousities to be known only by NPCs isn't a good idea. The definition of what is a spoiler is just too wide that it becomes restrictive.