You would think that, but it happened to me several times over the course of about five years, with different parts of the core of the os. Granted, this was back when arch was in its infancy, before systemd was even a thing, so pacman may be smarter now. But I’ve completely written it off since it happened so many times. And reinstalling arch back them took the better part of a weekend, so it’s not like it was an easy fix.