If you’re not overthinking it, you’re doing it wrong. This isn’t your run-of-the-mill anime; this is Index. It’s a very deep series full of scientific concepts, religious concepts, mystical concepts, political concepts, moral concepts, economic concepts, philosophical concepts and any number of other deep concepts. There is a lot in this series that’s blatantly unreal, but it’s all designed to reflect reality just enough to feel like it COULD be real. Like, if magic really existed, how would it function? If psychic powers were based on science, just how many applications would they have (cough, cough, Vector Change). So by all means, overthink it. Overthink it and seek out information to explain your theories and answer your questions. If you don’t, you’re not getting the full Index experience.