I find radical changes in users' "display name" (because of user's own will or accounts merging or else) rather confusing.
Particularly when reading comments because when the link to the commenter profile page is updated accordingly, comments including the @user_display_name are kept unmodified.
In case of old posts with many comments from many users, understanding what comment is addressing what other comment becomes a hassle.
Could some bot also update these @user_display_name in the comments when the display name of some commenter is changed ?
Alternatively, is there a possibility for the standard user to access some sort of history of display name changes ?
Additionally, what should I do when some comment of mine appears to me just unrelated because addressing some comment from @old_user_name I just cannot find ? Simply delete it ?