Because that N became the dominant computing company for a generation?
Apple was way ahead of Microsoft with windowing technology. Gates even offered to help Apple port it to the x86 architecture. He was content with being the dominant application developer, not the OS.
Jobs blew him off so he seized the opportunity.
Around the same time IBM was working on OS/2, which was a much better technology than Windows. Microsoft worked with IBM on OS/2, but then gaslighted them by "debuting" Windows 1.0
Edit: And don't forget how me VC pitches are about "what we're going to build" vs. "what we've already built."
Vaporware is not an optimal strategy, but in many cases it works.