New discovery - when you go to insert a comment, it will start by placing it in one location, but then when you "send" it moves the comment below some of the other comments in the document. I don't know why it couldn't have been designed to simply post in the same location where it first appears. Why would they move the comment location between initially inserting and posting? This just adds to completely disorienting nature of everything else going on with the changes.
I discovered this when I added a comment saying "refer to this person's comment below." When I clicked "send," the comment physically moved below the comments I referenced, so I had to go back and edit and change my text to "above."
And the reason I had to add a separate comment, instead of noting it in the discussion thread, is because I need to add reference notes that I absolutely do not want to be sent to other team members. I have to add extra comments as bookmarks about info that needs to be researched further, and I need to ensure that people won't get tagged.