Glad it at least indirectly addressed the elephant in the room which is that it's a temporary tech advantage. Primitive firearms and cannons are a revolution vs those with nothing, enough to buy them a decent number of years for sure and make all the difference in this war, but there isn't really any true secret sauce. If anything it's even worse than it said, because no actual capture and RE is necessary (though that might save some time), merely seeing the concept at all, even once, is enough. It'd take other countries some experimentation, but there is enough metal working expertise and resource base in the rest of the world that it's inevitable it'll get independently recreated (with improvements) and kick off an arms race from there just like IRL. One of the classic conundrums in war, few things are better then a real surprise tech advantage vs a peer, but few things are more transitory as well.