Nothing to extend/extinguish. UNIX existed first, and has a very different use-case. Linux shares that history.

NT was developed from DEC Alpha, which came well after Unix (so learned some lessons from it). I don’t see it being inferior to Unix/Linux, but different.

Both have strengths and weaknesses.

One area that Linux really beats Windows is the IoT/embedded/low power devices. The NT kernel just has too much built in.