Correct. You can draw just as messy a diagram for Windows. DirectSound versus OpenAL versus gstreamer(win32) versus jack(win32) versus XAudio2 versus DirectShow

Correct. You can draw just as messy a diagram for Windows. DirectSound versus OpenAL versus gstreamer(win32) versus jack(win32) versus XAudio2 versus DirectShow versus DirectMusic versus WDM Audio versus WASAPI versus UAA versus … If there's any difference it's that under Windows, the only debugging and error handling you have is "lol reinstall all drivers and codecs and pray".