I had just forgotten something simple (unload the threaded comments CSS):
Before:
removeDangling();
safeGM("removeStyle", "hide-defaults");
After:
removeDangling();
clearMores();
safeGM("removeStyle", "hide-defaults");
safeGM("removeStyle", "threaded-comments");
This is live on testing, but might take a sec to propagate due to GitHub’s caching feature.
If using KES, check
General > Add mail icon
to append an icon/label next to a username to directly message them. (If on the same intance as you)