Bumping this because
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People could in theory just edit a post back if they had the old raw data on hand, so this is exclusively a QoL feature to allow them to go back to edits they no longer have the raw data for
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Mods already have this capability, so it surely already exists, and should not take much work to extend it to the original author of a post
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Based on the above two points I can think of no reason it shouldn’t be enabled, as it seems well worth the effort of merely extending permission of this feature to the author of a post