Prettymuch, yeah. It's clear that some portion of the fanbase are dead certain that this lightning aspect is something super special and unnatural, but the lorebook sets out that this sort of thing can be just how the world naturally functions.
Simple enough, the recently released third lorebook had a page on a "hypothetical common ancestor" to the Eorzean and Vrandtine alphabets (basically Eorzean with a few extra lines, used on maps in Amaurot and Elpis), and then a week later Fan Fest gave us the setting preview for S9 which conveniently is using that very same proto-alphabet.