It would make it easier to deal with tangents or replies that are going off topic.
- Make them collapsable to not interrupt the main topic convo flow.
- Let owner and contributor move existing messages into a tangent to start one or link to an on-topic message from an existing tangent.
- Let commenters start a tangent from an existing on topic message
- Also give a button or something to convert a tangent into a new issue.
This would definitely help some of the Big Problem megathreads where the problem is legitimate but owner/maintainer isnt fixing the problem because they feel the thread is too large for them to digest.