I think what made people feel the need to create "new" fear categories that the Smirke's fourteen "missed" was the fact that they themselves narrowed the original categories down to just a few (mostly aesthetic) traits. "I came up with a New and Completely Separate fear that doesn't fit in Smirke's fourteen" open your mindddd Smirke's categorization is just a collection of colorful umbrella terms you can fit whatever you want under there
Additionally the categories aren't even able to exist in a manner that completely separates one fear from another. They not only can but NEED to be mixed