That is what I kind of tackled above, I think: In practice, all blog engines will confirm that the URL the trackback points to actually contains a link to the site receiving the trackback. I see no practical difference there between the two protocols. But your use of comments and comment urls makes me think I might miss your point?
Thanks for opening the issue, I will add a comment and subscribe.
Thanks for opening the issue, I will add a comment and subscribe.