Play Services will still download XML configs only when you are actively using the phone (foreground). Background sync, push notifications, and auto-updates will cease. This is a “disable-almost-all” approach.
Play Services XML files are used by Google Play Services to configure and provide data for various Google services, such as Google Maps, Google Drive, and Google Play Games. These files are periodically updated by Google to ensure that the services function correctly. disable play services xml download