I want to comment on this assertion:

"Posts are assigned to sections based not on their subject matter but on their type of discourse."

This does not seem to be entirely accurate. The PerlMonks Discussion section is indeed a separation by subject matter. Questions and meditations about this site itself rather than about Perl the language go there. That is a division by subject matter.

If we exclude the PerlMonks Discussion section, then indeed that axiom holds true. So perhaps the self-referential nature of PerlMonks Discussion excludes it from the axiom. I think we still have a problem going into the future.

The reason that you did not divide by subject matter is because the subject matter was all the same: Perl. And in the past, "Perl" had one unified meaning. However, as we move into the future, Perl will have two meanings: Perl 5 and Perl 6.

Eventually, to reduce confusion and promote clarity, we will be forced to often specify which Perl is meant when we refer to Perl. This might be done via a different section or some other means, but I do not think the idea should be ignored.