A better analogy is some sort of third-party API rating system. Consultancies put out big whitepapers about what a "storage service" is, and what the relative quality of things like Amazon/Google/Microsoft's offerings are. The change in definition of e.g.
Pluto might be analogous to that company originally having classified Amazon S3 as a "backup service" before deciding that it was really a new category of service that has now spawned many competitors.
The classification is designed to help us reason and talk about like things. We can all see how Amazon S3 and e.g. Dropbox are fundamentally different categories of service, and they need different names. We shouldn't be afraid of reclassifying things because people will have to change their models. The point of recategorization is that the old models are not as useful as the new models.
Pluto might be analogous to that company originally having classified Amazon S3 as a "backup service" before deciding that it was really a new category of service that has now spawned many competitors.
The classification is designed to help us reason and talk about like things. We can all see how Amazon S3 and e.g. Dropbox are fundamentally different categories of service, and they need different names. We shouldn't be afraid of reclassifying things because people will have to change their models. The point of recategorization is that the old models are not as useful as the new models.