We’ve got two excellent use cases for this.
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Personal journal outlining a member’s trading strategy (think stocks or options trading). Majority of members change their strategy often over the course of their trading lifecycle, and that definitely happens outside of our edit window of 10 days. We have members that are going on 5+ years membership, who still tweak their strategy and want to journal that for themselves or for the rest of the community.
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Informational posts, where the first post is edited to reflect changes to say a list of companies that caters to our members. The company names changes, some stop catering to us, etc. We have a topic that’s been running for over 8 years. The first several posts are a running list, with company information. The remaining posts are the discussion about said companies.
The workaround has been the wiki post, but that doesn’t give the OP complete control over the post, and leaves us open to spammy actions.
We’re looking for a hybrid approach, give the OP indefinite edits on at least the first post, or allow the OP to set how many of the first several posts he can edit (as long as he’s the author of those posts, so something like the first 5 posts, for instance). All existing permissions/rules about the edit window would still apply, except for the OP.
vBulletin had/has this in a plugin.