The purpose it serves it purely one of feedback, by the community-at-large(*), to the authors of nodes.
That's what I've been saying ;-)
I agree on what you describe as the special atmosphere at PM; although I think that while maybe especially striking here, it is not restricted to just this site but seems to be a common theme among the Perl community in general. Which is one reason I find the language such a nice, cozy experience.
Makeshifts last the longest.
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