The work to indent replies on ForumTopicPage is great but when the topic spans multiple pages the replies don't behave properly.
https://community.jmp.com/t5/Discussions/How-do-I-join-two-data-tables-without-losing-data/td-p/28757/page/2
Note that the reply on page 2 of this discussion is shown as if it's posted by the original author of the topic, but it's not.