Post is interesting, I give you that. But why should we ignore categorization all of a sudden? "Show HN" is strictly about something people can use or play around with, not just read, this is defined in the rules/guidelines of HN itself. For the same reason good titles are enforced, so it gets easier to navigate everything.

I stand corrected, I agree with you now that I see it that way. Thanks for the perspective.

I agree - this post is really interesting as I've been following Black Magic for a while and doesn't bother me that much but perhaps it doesn't belong in the Show HN section as it's not showing anything new technically