Currently comments in proofing documents are one-directional (from the proof to Workfront) and only for added comments. When a comment in the proof is deleted, it is not deleted from the document feed in Workfront. Also, when a user replies to a comment in the document feed, it is not posted to the proof. Both feeds need to speak to each other seamlessly.
In the case of deleted comments in the proof, users are confused when they see 2 comments in the proof, but 8 comments in the document feed. They worry that they're missing key feedback.