"...from producing a world-class operating system..."
Hang on, this is Microsoft you are talking about, right?
I don't think ubiquitous equals "world-class", There are and have been other OSs that could claim the title, Nextstep, Beos, Unix and Gnu/Linux come immediately to mind. You may be able to think of others.
Just because something is widely used does not make it the best solution, just look at systemd for a glaring example.
As a piece of graffiti I saw once said "Eat shit, 10>12 flies can't be wrong."