I've adjusted the wording slightly.
This is something the SO mods and I are experimenting a bit with right now. There are a small handful of questions that are not exactly appropriate for Stack Overflow, are popular and have useful answers where the primary value arises from the community's regular efforts to keep them updated via edits.
Historical Locks are inappropriate for these, as they would then become ineligible for editing (thus destroying the one bit of value they bring to the site). The intent here is to emphasize the one valid use of Community Wiki:
Community wiki is for that rare gem of a post that needs true community collaboration.
As I said, this is an experiment. We'll see how it works in practice.
