@b0rk thanks for working on this, it's great to see work on improving docs for such a well used tool.
I saw your email thread viewer used jwzthreading, and just in case it comes in handy - long ago I also wrote something using that, and there is a bug in that library that loops forever with some threads that end up having cycles. The original repo never got the fix, but I see there's a version at https://github.com/FreeDiscovery/jwzthreading that handles the case I found correctly.