Yes, we were already working on stuff like this in the 90s. But Nostr plebicizes it and actually humanizes it, again, as one Nostrich in Helsinki or Nairobi with a keen interest in Topic XYZ can do these categorizations about whatever obscure topic they are interested in. That's why we're so excited. We want _everyone_ to be able to be a librarian. Everyone gets to assemble and categorize their own library or choose to use Npubbunchofnumbers' library.
That's why I now refuse to perform categorizations for other people. I am giving everyone the means to categorize things for themselves. Anytime you run into something that looks like a Nostr spec, you can just add a "Nostr spec" label to it and move on with your life. Anyone who searches the labels for "Nostr spec" will see everything you tagged. Or you could use the labels from yourself and your WoT to auto-update a Nostr-based register of Nostr specs. In fact, let me go build that. 😂