I noticed that an answer was flagged a year after posting. I am not sure I understand the value of doing this. As a teacher I believe in giving more immediate feedback. I am thinking that someone relatively new to the site would find it very odd to get negative feedback so long after the answer was posted and am wondering if he will even see it. Is the value to our "readers"? Would appreciate hearing thoughts on this practice.
Since it looks like I am the one that first flagged the answer: the question was bumped to the front page by a new answer. While looking over the other answers to that question, it seemed to me that the answer under discussion here didn't address the question being asked, so I flagged it (and commented) under the theory that irrelevant answers should be deleted.
Note that the goal was not to give feedback to the answerer, who is very likely gone. Instead, the goal was to clean up an answer which was (in my opinion) of low quality. I left the comment to indicate to other reviewers why I thought that the answer was of low quality and should be removed from the site (and not really to give feedback to the answerer).