It does make sense. Thank you. 
Just to add more context, I’m the only admin of my forum and I agree that if I train myself to only post things that I’d be comfortable sharing with all my future staff 10 years from now, then that would eliminate the need for redacting anything.
I would find it helpful to have a saying in what should and should not stay in the database when I edit a post, but I understand that there might not be enough Discourse users who would expect that level of control from a forum software.