You seem to be missing the point that PerlMonks posts are HTML-formatted. Converting \n\n into <p> (or whatever) means that's no longer the case. It breaks people's expectations.
Now, if you're proposing that we support — in addition and completely separately — a plain text format, that's a notion worth considering.
But plain text is not html. Users would not be able to add any kind of formatting markup on their own.
Personally, I think a much better idea is to support — in addition and completely separately — markdown formatting.
(I added an entry in the pmdev to-do wiki for this.)
I reckon we are the only monastery ever to have a dungeon stuffed with 16,