Comment by bbv-if

To name a few: when systemd was introduced; when there were changes made to the file structure (moving everything to /usr); when kde4 was replaced with kde5. And there were more issues, I just don't remember all of them. Reading the news before the update could have helped sometimes but I don't do that every time I execute `pacman -Syu` for various reasons; and sometimes problems are unexpected or just bugs fixed on the next update.