In this question, barbara said the following thing in her comment:
(i addressed you with the comment since yours was the only one present, and only one "target" is recognized.)
As far as I understand it correctly, she wanted to address the people who voted for the closure, and happily one of them as well left a comment there (which is not always the case). Therefore I think it might be useful to be able to @-target the people who voted for the closure.
