We don't particularly want comments on our media, and we certainly don't want the additional system load that the comment portion of the Jetpack Carousel can cause.
I don't currently see any good way to disable comments in Carousel. I have seen posts on how to disable the ability to comment ( http://www.wpbeginner.com/wp-tutorials/how-to-disable-comments-on-wordpress-media-attachments/ ), though this didn't seem to do much for me. And definitely each image load in the Carousel still resulted in an AJAX call to determine the existing comments.
I also saw people suggest using your style sheet to hide the comments, but this still results in the ajax calls.
I realize these calls shouldn't be that dire, but when a page with a carousel gets a large amount of traffic, it can just crush our server.