Well, it’s every weapon, regardless of class, so… They all do damage on a miss, under certain circumstances. But magic and other effects are much more subtle, so you’re not fireballing or having flashy big magic effects either.At which you can ask, "why don't all attacks do damage on a miss then? Why do you need some sort of special feature for that effect"?
One could also ask why you need special features and ability bonuses for everything as well. To make things different. A dagger isn’t going to do as much shock as a maul, for example, and you’re going to experience more shock if unarmored than bearing at least a shield.

Though I will say that I had a player in my 5e campaign use the Next playtest fighter with the maneuver die, which also allowed him to spend the die to do damage on a miss, and he enjoyed the flexibility and decisions about which maneuver when. It also didn’t break the game either against other 5e characters.