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I strongly disagree with this, any error message shown to the user should be helpful to the user
I think you misunderstood, this is about exceptions, which shouldn't be shown to users unless they ask for it.
Exceptions are not helpful to users most of the time, as shown above. They need instructions on how to report issues instead since they most likely can't fix an unhandled exception by themselves.
Underrated comment.
To put it into user perspective:
Exception X with error code xxx means Y. Y should be shown via a modal dialog to the user. The state of the application has to be reverted to a valid state as error handling.
The exception/error gets logged, the user doesn't receive a exception but the interpretation of the error is shown to him via the UI.