In some distros featuring KDE Plasma (like KDE Neon, EndeavourOS with KDE), I have seen software update section in system-settings. Why is it not there in Manjaro KDE? (I have KDE Discover installed besides pamac in Manjaro.)
In Endeavour:
We inherit that package from Arch and we discourage automatic updates or doing them without reading the announcements. Sometimes manual intervention is required and we put that in the announcement wiki for known issues and resolutions.