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Could we have a "Close as outdated" close reason?
A sort of a solution to this problem, but would also apply to posts such as moderator elections, one-off proposals (though status-complete also works), and just generally posts which at some point had relevance but no longer, (such as some questions about comments once the new comment system is implemented).
I propose adding a close reason, "Closed as outdated", with the option to link to a more relevant post such as in the case of the Panel discussion, or a link to the change which made the question obsolete.
A proposed close text might be, "This post is no longer relevant due to <insert reason here>. (optional: For more information, see <insert link here>.)"