Could be because like most stories in the Bible (or religious texts more generally) that the lesson learnt is often vague or implicit, and therefore may not even exist.
Could be that the lesson is that the person who never picks up Twitter or works at Facebook in the first place is never celebrated because they were never lost to begin with (in this context). But the person who quits Twitter or resigns recognizes a sort of lack of direction, and that is what is celebrated. Not the person. The process
Good point. These stories were not designed to teach us something. Maybe they often do. But they are just stories which people like (to hear and tell) and therefore they have survived in the memic evolution.