It's more convenient than the google auth app, and still requires access to the physical device at the time of log-in. For anyone unfamiliar with it, Google Prompt makes a window pop up on your device to confirm your login. This is used as a substitute to the Google authenticator app that requires a timed code to be typed in. More info can be found in this article: New Google Prompt two-factor authentication method is built into Android, available on iOS
