[Update] You cannot delete the stock apps with iOS 10
Few days ago, media including BrightTitan said that you could delete the stock apps with iOS 10 but you cannot completely”delete” them.
After personally trying the iOS 10, we tried to delete the stock apps. After holding the icon of the stock app for a few seconds, you will see the delete button and then you will be able to “hide” it from your device. Still, in order to restore the app, you are asked to go to the AppStore but when you click on the “download” button, you will not see a progress bar because you are not either deleting the app or downloading it again. You are just removing the app from your home screen and then restoring it.
— Martin Gordon (@gordonmb) June 13, 2016