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>>32251
There isn't an answer that will satisfy you. One cannot start asking WHY an author chose to have the plot go one way or another without simply being an idiot. You want to know the reason Naruto is about magic ninjas instead of armies of realistic soldiers equipped with guns and missiles? Because the author wanted to write a goddamn manga about magic ninjas, because preteen boys in Japan (and, it so happens, elsewhere) happen to LIKE magic ninjas. That's all there is to it. Is the technology illogical, apocryphal, downright schizo? Yes, definitely yes. But does anyone care? No; because using the technology to do things which are not related to magic ninja would cut into the time to tell about magic ninja. Kishimoto (the author) isn't a terribly smart guy. He ripped half of Naruto off of Dragonball and the other half off of stuff Togashi wrote (YuYu Hakusho, HunterxHunter). All he wanted to do was write a manga about magic ninja, which he did a fairly good job of for a while (less more recently, but that's just my opinion) and screw everything else. If he wanted a gritty realistic story about proper use of military muscle, he would have done that, but he did not want that!
(Also, staying in-universe, I think you missed what I mentioned about each country being on the edge of annihilation, and barely able to stay in balance with the forces of the other countries, while trying their hardest. If they devoted just ONE PERSON to science instead of inventing ninjutsu, that might be enough to cause them to be invaded and destroyed. Besides, we've seen several jutsu [in particular everything the bijuu and/or Uchiha do] that are literally on the scale of atomic weaponry. I've no idea how far you are in the manga/anime, but there was a dude named Pain a few arcs back that used a single massively-scaled-up jutsu to FLATTEN the entirety of Naruto's home village. It was basically a gravity-based nuclear bomb. Yeah, most ninja don't have the power to do that, and it was kinda a game-breaker to introduce it in the first place, but it DOES exist. The countries in Naruto have ninjutsu, and they're committed to ninjutsu, and while they're in a state of constant war or Cold War, they have to devote all their time and power to developing ninjutsu. To reference an oft-quoted condition of the old Soviet Union, they cannot support a Guns-and-Ninjutsu Economy. Perhaps when Naruto unites the world with his... Naruto-ness, when everyone is in peace and happiness and eternal brotherhood [and other such things John Lennon would extol] some people will have the time to start a Renaissance of sorts. But it won't happen right now because they're too busy using what power they have to keep themselves alive.)