::Well, I didn't like it when it happened, because I had no clue what happened, and archiving worked for me this year in another talk namespace. But now that I know it it's no big deal, at least I can blank any nonsense I've written in namespace 1 before somebody answers. Unregistered users being able to archive talk pages is not essential. Maybe it's not desirable, after all you must have had reasons to create the filter. But documenting the fact would be good, something is different, desirable or not. –