While that is true, for correctness appends should supplant updates. On HN, many users (like myself) have posted comments for over a decade. Suppose I changed m

While that is true, for correctness appends should supplant updates. On HN, many users (like myself) have posted comments for over a decade. Suppose I changed my username from "bjourne" to "SpongeBob"... Should the comments I wrote in 2010 show up as having been authored by "SpongeBob" or "bjourne"? I'd strongly argue in favor of the latter since the former would constitute falsifying history. The "change" in username should be viewed as the creation of a new personae rather than a "change".