In the last few weeks I've taken up the habit of writing my posts and replies on use.perl.org as plain text, using markdown markup. I then run the markdown script from the CPAN module redirecting the output to an HTML file, preview in a browser, and finally copy/paste the HTML into the use.perl.org textarea, and submit.
The difference in effort in marking up prose text in markdown rather than in any other system use.perl.org allows (such as the allowed subset of plain HTML) would appear to be slight, yet it is quite relevant to me. Even my rather clumsy workflow is still preferable to me, than using the site's standard HTML markup.
And maybe it's an idea to modernize the comment system in use.perl.org a little, as more and more people apparently utter their dislike for the current system.
But likely they think there's still a lot more wrong with it, than just the markup system.