How are System Preferences categorized in Catalina?
According to /System/Applications/System Preferences.app/Contents/Resources/NSPrefPaneGroupsBanner.xml, there appear to be 3 primary categories now:


__banner - Apple ID and Family Sharing pref panes
personal - the set of pref panes from General to Security
hardware - the set of pref panes from Software Update to Startup Disk (or more, depending on your hardware)


Two further categories are listed in the file:


net - empty, unclear what pref panes would go here
addons - this category is historically used for user-added PrefPanes, and presumably remains so in Catalina