Arch Wiki has still this warning
Warning
As explained in a GitHub comment by a Package Maintainer, “Handling system packages via packagekit is just fundamentally incompatible with our high-maintenance rolling release distro, where any update might leave the system in an unbootable or otherwise unusable state if the user does not take care reading pacman’s logs or merging pacnew files before rebooting.”
Yeah I just forgot how the old stuff worked