- There's no equivalent of "git blame" that I can find to see who/when a particular line/paragraph/section changed.
- I can't see if there's a way to view my changes separate from other edits to the document, or isolate changes by single authors generally.
- "diffing" via the "compare documents" action seems to want to generate a new document with track-changes edits for changes from old/new, but mangles the histories to present all changes as by the invoker of the diff, at that time, which isn't all that useful.
It's definitely better than nothing at all, but a long way short of where I'd hoped we'd be regarding collaborative document authoring at this point.