[member="Alyesa Organa"] - Specifically one of the modern nanotech is working to create or lengthen telomeres in DNA/cells, so that aging is slowed or stopped. At current the theoretical inclination is it won't be able to keep you alive forever (cancer, etc..), but that aging itself wouldn't kill you. I don't see that as being a problem. When you use it for regenerative purposes to never die from violence, you are violating a site rule. So no need to ban that from the Factory, it is already covered. Really being 'ageless' has no bearing on anything fairness related, that isn't covered or prevented by other rules. As well 'benefit the community' is terribly subjective, and we need to be objective here. What benefits the community changes from writer to writer. And why not an NPC bomb? It's loosely cannon, and is no worse than people rolling up in massive beskar battle tanks that are absurdly hard to destroy (And which I love personally).
I say bring them back. Restricted materials makes sense. Something akin to the A.I. challenge would be best, forcing people to detail with the medical/scientific end of it. You make people do more than handwave their toys, and 90% of those looking to abuse the tech (who are consequently usually lazy louts as well as munchkin/power gamers) will scatter like so many cockroaches in the light.