I'm not sure what you mean by the flatpak comment. "flatpak update" is the (built-in) command update all your installed flatpaks. What is not built in is a dae

I'm not sure what you mean by the flatpak comment. "flatpak update" is the (built-in) command update all your installed flatpaks. What is not built in is a daemon that regularly runs this, because the idea is to integrate that with the UI. So, the application installation ui you use (gnome-software or kde discover) will regularly call this update for you, however you configure it.