Often, commenters will respond to a specific previous comment by commenter 'Bob' like so:
"@Bob: Good idea, but ther's a problem."
Some months later, Bob changes his name to 'Bobby'. Now, his comments will be signed with 'Bobby', but the comment referring to his still reads '@Bob'.
Could the administrators refactor the site, so all @Bob references get changed to @Bobby?
This issue can become confusing or even indecipherable in a comment discussion.