Apple considers widgets to be a major new feature for the iPhone, iPad, and Mac and will continue to push their use and the number of Widgets as well as the number of apps containing widgets are sure to grow. As widgets are built into the apps the only guaranteed way to prevent their re-appearance would appear to be deleting any app that has a widget. As I mentioned previously, those include the following Apple apps: App Store, Calendar, Clock, Contacts, Files, Find My, Fitness, Game Center, Mail, Maps, Music, News, Notes, Photos, Reminders, Shortcuts, Siri Suggestions, Stocks, TV, and Weather in addition to a number of third party apps. Unfortunately many (most?) of those Apple Apps cannot be deleted as they provide essential functions throughout the device as well as to other apps.
