This question already has an answer here:
The How do I delete my account? page states that your questions and answers will be anonymized and disassociated when your account is deleted. Why doesn't this apply for comments as well? Any comments that have @-mentioned the deleted user remain unedited thus revealing the very thing that was supposed to be disassociated from the question/answer.
I think all Stack Exchange sites would benefit from a feature which anonymizes all comments in which a deleted user was @-mentioned. For example:
The following comment:
@Chris please provide more info about...
Would instead become:
@user306512 please provide more info about...
I have zero legal experience so I might be entirely wrong here, but I believe that with the modern legal standards regarding privacy, the right to be forgotten and the upcoming EU data-protection regulation this might be something worth looking into in order to better protect users privacy and identity.