The device is at a remote location.
The configuration is changed.
You messed up, and the device goes off line.
You have to physically go there to restore the previous (working) configuration.
To have an option (or even default) that when one hits “apply changes” and the configuration changes, there be a confirmation page that requires an affirmative “OK/it works” button. If that button is not hit then the configuration reverts to the previous (working) one after <N> seconds (e.g., 30).
Support does not have to schlep through sleet and rain and snow to get the device back on line.
Other vendors of potentially remotely deployed devices provide this feature. It has been very helpful at times.