I had comments deleted on a question, losing some interesting information, which prompted me to raise this meta.vi question about how to see comments.
This meta.SE question shows that there is indeed no current way of viewing deleted chatty comments.
I understand that some comments containing sensitive information shouldn't be shown after they are deleted by a moderator, but in the majority of cases, it would be show how the question and answers developed if the comment history were viewable.
So I propose:
To implement a way of allowing users to see the history of deleted comments, and for those with delete comment privileges to be able to opt-in to hide the deletion from this history.
Also note that this related request is about users seeing deleted comments on their own posts, and doesn't mention sensitive information. This is about users being able to view all comment history except comments marked as sensitive upon deletion.