Originally, everyone had access to their own post history. This was removed because it caused an issue with privacy: sometimes we redact personal details that have already been quoted, and have to edit quotes too. Posters could then still see the redacted material by looking at this history.
Short of seeing a reason not to make this change, I'll likely be returning this after I inform the staff members of how to purge these post history snapshots that contain the sensitive information.

