Aha!..I guess if one actually came across an archived post it would be good to be able to 'edit' it; though, I'm not sure I'm a fan of this. Once I upvote a post, I'd hate to think someone could go in and write a totally different 'opinion' piece, contrary to the post I approved of.
I know that's unlikely; and, that it's all on the blockchain; but, everyone, well most people might agree that once it reaches payout, it's pretty much a wrap. That said, it's good to know changes are in the works to make Steemit better; dispelling rumors that it might be replaced.
Best regards.
Peace.