I don't recall what happened with that thread but the trend is that the popular general-interest questions would sometimes overpopulate the front page, because of redundant additions and new posts that are so many pages down that nobody would ever read them (or even check to see if they duplicate previous posts).
So the idea is to close them. If there's sufficient good new ideas to contribute to such threads, a new thread could be created. Or someone could propose some good new ideas here and lobby to have the old thread reopened for a time.
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