Determining a presidency's success by inspecting its "first hundred days" is a bit of an artificial construct. If humans were born with 12 fingers, then perhaps we'd be evaluating presidents based on their first 120 days instead.
What's a planet? What's a dwarf planet? Should we make a distinction? Should we really care about these definitions in the first place?
As we learn more about the outer solar system, the boundaries begin to blur.