If you use social media, you may know that all comments others posted on your own posts can be deleted by you if you see that it is unnecessary.
I know StackExchange is not a social media system, but its format is somewhat the same as social media (there are posts, there are comments, there are up/down-votes (like "Like"/"Dislike"), there is even chat). So I think it is good if we can delete comments on my own post.
Some of the comments recently posted on my posts are very looooong and not useful at all. That is why I want this feature.