To me, the earth-normal part can be explained by scientific principles, or not. What I am pushing back against is the idea that it cannot be explained by science. Maybe D&D leans on the fantasy-side, but it doesn't have to; you can use science-with-exceptions instead, and generally that's what I want. What if magic is a fundamental force that allows the supernatural (like flying dragons and other breaches in the laws of physics) to exist, but otherwise science holds sway? How much would a typical D&D setting suffer if the magic went away, even for a little while? I can imagine a world that suffered a calamity that removed all magic for just a very short while, then turned it (mostly) back on. How much paranoia would magical creatures and spellcasters suffer, knowing their world could just be turned off like a lightbulb, without knowing how or why (it's more fun I think for it to be a mystery)?