During the discussion on Unix-domain sockets on Windows, someone pointed out[0] abstract Unix-domain sockets.
This reminds me on a somewhat random note that SSPI mode authentication should work out of the box for unix domain sockets on Windows.
The main reason we probably can't use it as a default is that SSPI isn't easy to implement for pure language drivers, it requires Windows API calls to interact with the windows auth services. It's a pain in JDBC for example.