You joke, but let me tell you a story from an old man who I used to work with many years ago.

He told me that he helped develop this new missile system that had an advanced informational feature intended to be mounted on aircraft under the wing. In fact, it was so useful that the equipment was giving the pilots better information than the actual purpose built onboard aircraft systems. Pilots loved it! It was so very good that none of them would actually shoot the missile. Supposedly pilots had to be ordered to fire the thing to collect performance data because it was just too useful from a user experience perspective to be used for its intended purpose.

Task failed successfully? Apparently they thought minus one missile was a pretty good value.