Much as you generally run HN moderation well, I disagree. If the cofounder matching worked well these treads would not exist.
A monthly or at least quarterly thread enables a quick browse of what people are interested in creating. I enjoy the sentence or paragraph cofounder pitches that can be read in seconds instead of going through scores of profiles. I raise my digital pitchfork in support of these threads! 43 votes for this thread in 3 hours, seems others do to.