Well, what made you think to make this appeal for Pluto and not the others like Ganymede, Titan, Triton, or Ceres? As I explained here, the eight largest worlds define their own regions of the solar system, while these smaller ones all either orbit others or are part of belts of similar bodies. There’s a very natural split here.
I think it’s useful to distinguish between these groups, less like various size rivers and streams and more like the few continents and many islands. Particularly now that we are finding similar categories, exoplanets with cleared orbits and debris belts, around many other stars.
I’m not sure I’d go that far, though. 
Pluto is a bit less massive than Eris, but apparently a bit larger in terms of radius. But it does underscore how Pluto is really one of many, just as Ceres turned out, and with how people have reacted it’s certainly earned its name.
