I did notice your miserly mud practice and eagerly await your mud video
As for the anecdotal testimony you have often heard about naturals giving a better edge in some way, I have made a career out of disproving what people accept as fact. Moreover, did the people who claimed better edges from naturals have synthetic stones like the magical Nubatama 2K, or the equally magical ultra fine 1 micron and .49 micron Shapton Pro and Shapton Glass stones? At one time, everyone "knew" that the earth was flat and that the sun, and other heavenly bodies, revolved around the earth. And quantum mechanics will never make sense to the average person.... You get my point.
That being said, the Hakka is magical, too, and, as you point out, is a pleasure. Although it is a rare stone, even I have heard what a beautiful experience it is to sharpen a knife on a Hakka. Although I may prefer to listen to Chopin's Nocturns, Mozart's piano sonatas, or even the Rolling Stones, I have no claim that my preferred music is better than Lady Gaga (although I am certain that my preferred music IS better than any of Lady Gaga's songs....)
As I said, if someone claims the earth is flat, or that natural stones leave a better edge on a knife, then show me scientifically valid, and falsifiable data, and I will put them to Karl Popper's test of falsifiability. Until then, I will believe that the earth is round and that modern synthetic stones give you an edge as good as naturals.
In the meantime, I will remain convinced that Chopin, Mozart, and your beautiful Hakka MUST be better than Lady Gaga's music....