I may have missed a few things so if I'm completely off I apologise. What if the reason the parshendi and parshmen get so offended by the bodies of their dead being defiled is because even after the body is "dead" they can be transformed into the voidbringer by the storm? It would make sense considering how long the war has been raging and if they can be brought "back" to the right after death then they're almost impossible to defeat.