I don't really see this as a "massive extreme" or "pointless." Pointless relative to what? It's an event in the game. The rules cover how to handle this as
@Charlaquin has already stated, so we'll just have to see how this adds to the story we're creating by playing.
As it happens, the current game I'm running does have a random encounter that might go this way - a single eagle which flies away if it notices anyone approach within 30 feet. That's it, that's the encounter. Do they loose an arrow at it? Sneak up on it and try to stuff it in a sack? Communicate with it from a distance? Give it a wave and pass on by? What does what they do tell us about the nature of the characters and their priorities?