Without editing, you could be sure that everyone saw your follow-on correction. With editing if people read the first version of your opening message, you don'

Without editing, you could be sure that everyone saw your follow-on correction. With editing if people read the first version of your opening message, you don't know if they saw the edits or not. I find edits useful for typos/formatting/cosmetics, but I don't ever edit significant information into a previous post for that reason.