Magi using spiritrons doesn't mean science cannot also use spiritrons. The whole point of science messing with magecraft is that it can and will eventually capable of replicating everything magecraft (and even magic) can do, making magecraft no longer needed. The magecraft that allows you to talk to your buddy miles away is no longer needed because the telephone is invented. Even worse, the telephone allows everyone with it to do that, while to use the telephone magecraft one needs to be a magi.
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Or to give another example. In SMT the genius StephenHawkinginvented the COMPs that allows any and everyone with it to be able to summon and control demons as will. Demon summoners, summoning magic and the likes are no longer required. It would be like in a future Fate works, some smartass creates a phone app that allows any and everyone with the app installed to be able to summon a Servant. To the trash bin with all that classic holy grail and summoning circles and the likes. And this is very possible, because Chaldea is pretty much half way there.