There’s a headcannon I’ve heard of that’s way better than the books. It says that voldemort was the master of the elder wand. The connection the wand has to personified death means that killing changing ownership makes more sense than disarming. But the real reason that voldemort lost is because he had so little soul left after creating 8 horcruxes and having them all destroyed. Him having at most a ninth of his soul meant he was doomed even with the elder wand.

The problem with this theory is that it actually presents a moral case that works the villain’s actions into a theme, so it’s clearly impossible for Joanne to put in her books.