When a user without moderator tools privilege (10K on most sites) opens a link to deleted question (example), they will see 404 page, which is clearly showing that the post is already deleted.
However, when they open a link to a deleted answer (example) / comment (example) on existing question, they will only see the question. There is no clear indicator that the link is supposed to be a deleted answer/comment.
I guess this is not a problem for experienced users, since they will notice it by:
- Looking at the URL and see if it's an answer/comment or not (indicated by post ID after the title, then
- See if the browser doesn't auto-scroll to any post (well, unless the connection is laggy)
But still, I believe it'd be better if SE shows a notification to show that the answer/comment is already deleted, perhaps looking like this?
One of the reason why I think it'd be useful is for spam/offensive answer hunting on chatroom. I understand that these flags should be used very carefully. When flagging spam question, there's no problem since you cannot flag if it's already removed. But for spam answer, there is a possibility that the user will think that the question itself is a spam if the answer is already removed (well, the onus is on the flagger, but with this feature, it can be prevented).