I do agree that an index value is a very useful and intuitive-to-humans way to represent the order of events, especially given the sheer number of events that have taken place through history. However, I do think it's important to note that the index value is only present as a representation of the order of events (and of the distance between them, which, as other commentators have indicated, is also important) and has no intrinsic value in and of itself beyond that.