A great Haskeller led to this document being made available. [1]
She didn't question whether Haskellers needed something like P6, she just implemented it and pushed Haskell to greater heights. I think that is a worthwhile point.
But I don't understand why you've introduced your point about what you perceive as the level of need for this document.
Given a non-zero number of lang X to lang Y documents, one or more of them will be the most likely needed, one or more the least likely. And given such a scenario, it'll likely seem one way to some folk and another to others. So?
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[1] The first P6 compiler prototype was written by Audrey Tang. https://en.wikipedia.org/wiki/Audrey_Tang The P6 project follows several principles she established such as being optimized for fun, and a "forgiveness > permission" policy for most contributions. So someone wrote a nice doc and it's been made available.
Duke Nukem Forever jokes, really? Look, Perl 6 can either be a "crazy complex" language that is "over-designed" and "hard to read", or it can some sort of toy with laughable complexity (your supposition is that Perl 6 is to elite programmers as Duke Nukem Forever is to elite gamers).
So which is it? Complex enough for only elites to grasp? Or just some toy language with no real capabilities, let alone unique features of interest to elite programmers?
I think you misunderstood or are trolling. This is a Haskell to Perl 6 guide. Haskell is for the elite programmers. Perl 6 is the Duke Nukem Forever of programming languages. This of course was all tongue in cheek.