pacman deleting config files on updates is a meme.
Quoted from "https://wiki.archlinux.org/index.php/pacman#Upgrading_packages":
"If a user-modified configuration file needs to be upgraded for a new version of a package, a .pacnew file will be created to avoid overwriting settings modified by the user. pacman will prompt the user to merge them."
Why do you still fall for memes anon?