> That is, start with Wild West and define specs as needed

Yes this is my personal hope as well -- if there are new index types that are widespread, they can be incorporated formally into the spec

However, changing the spec is a non trivial process and requires significant consensus and engineering

Thus the methods used in the blog can be used to use indexes prior to any spec change and potentially as a way to prototype / prove out new potential indexes

(note I am an author)