I would argue that it has not worked reasonably well. The part that worked well, is that only nation states have access to the technology. The part that hasn't

I would argue that it has not worked reasonably well. The part that worked well, is that only nation states have access to the technology. The part that hasn't worked well is that only a few nations, most of them being allies to each other, have access to them. And the countries have gone to great lengths to keep their own enormous stockpile of weapons while aggressively forcing other nations to not work on militarized nuclear technology (and at times civil tech) on the argument that once they have it, they will be able to bully their neighbours. And of course my stance is quite biased, because I am an citizen of one of the very few countries that has not signed NPT and agrees with the stand my government has made.