Well, I agree with what you are saying, and once it was my own creedo, but you have to be very careful when walking this "everything has to be explainable" nonsense.
Take a simple lvl 2 shield spell. I have seen a GM explain the invisible shield as an intense magnetic barrier that deflected attacks to an Android with a multiscaner. Sitting at that table, i winced inside, and sure enough, the Android started whipping non ferrous objects at the wizzard. Now the GM was stuck with his definition. Me, I learned to say the scanner picks up a large basket fruit.
Of course, I run and play in games that mix magic and tech freely, so these issues become important. Only so much needs to be actually explainable about something as inexplicable as magic, a force by definition that is impossible to exist, because nothing ignores the laws of nature.
lynn