The tech in Naruto is all pseudo-tech, the military tech tree is all ninjutsu core. For example, the Air Ninja have everything from floating cities to Bitterblade submachine guns, and Paine's Shurudo rockets. It's all Ninjutsu driven.
The highest level of technology is the Air Ninja Village, floating city is powered by zero tail, ninjutsu driven. Various weapons and equipment were also developed based on jutsu and ninjutsu.
Second is the rain ninja village (dawn organization), from a variety of modern industrial facilities and Payne shurudo with rockets, as well as the body to sit in the open Humvee can be seen rain ninja village's military and civilian technological strength is very strong.
Why do the five major ninja villages show a low level of technology?
The Air Ninja and Rain Ninja are both using the five major countries as imaginary enemies, but the strength of the ninja village is supported by the number of upper ninja and shadow level experts, for their own strength is weak, and the village of the sparse masters can only be wildly point of the technology tree to gain an advantage.
When firearms are less powerful than bows and arrows, it's still the Cold War era. A rocket is not even as powerful as an A-class ninjutsu, and it's expensive as hell, so who can afford it except for the tycoon Payne? Explosive charms are small and lightweight to carry and use are very convenient, who would go to study the bulky and complicated grenades?
Some scientific research often involves taboo items, such as human research, cloning technology, such as snake uncle is to engage in research was forced to go (snake uncle: can not stand it!