Yes, I am quite aware of the history of MS-DOS and Microsoft in general. It is, after all, my profession. Your synopsis does nothing to explain how Microsoft successively dominated each and every viable competitor in the PC OS and productivity markets; Digital, IBM, Apple, BEOS, AMIGA, Novell, SCO, Word Perfect, Lotus, DBase, etc.. These are not lightweights. Microsoft beat ALL of them. The quality of their competitors' products is unquestionable; many repeatedly reviewed as superior to Microsoft. Many are still. But none of them did as good of a job selling. Their superior products did not win the game.
No, IBM beat all of them --- or rather, corporate inertia of using IBM beat all of them.
Microsoft went along for the ride.
Competitors of IBM had to use Microsoft because IBM used Microsoft, and those few people who would get off on a limb by using some hardware other than IBM had to answer the question from their boss "Will it work with our IBMs?"
And a monopoly was born.