I am writing about chx's answer at https://travel.stackexchange.com/a/89766/19400.
A user asked whether pat-downs are to be conducted by officers of the same sex as the passenger being searched. I responded with a comment, pinging the user. A few seconds later, chx edited his answer to include the relevant sentence in the quoted material.
At that point, I considered deleting my comment, but decided to let it stand, since the ping should, by inviting the user to revisit the answer, inform the user that the request for clarification has received a response.
Now I see that the comments have been deleted, presumably by a moderator.
I find this sort of thing very frustrating. Sure, those comments are not critical to the answer, but they do provide context for the edit, and they shed light on people's thoughts about the subject under discussion.
Furthermore, what does it cost to leave those comments in place? What benefit is achieved by removing them?