[wormwood28]

"At the January 2000 Macworld in San Francisco, Jobs rolled out the new Macintosh operating system, OSX, which used some of the software that Apple had bought from NeXT three years earlier. It was fitting, and not entirely coincidental, that he was willing to incorporate himself back at Apple at the same moment as the NeXT OS was incorporated into Apple’s. Avie Tevanian had taken the UNIX-related Mach kernel of the NeXT operating system and turned it into the Mac OS kernel, known as Darwin. It offered protected memory, advanced networking, and preemptive multitasking. It was precisely what the Macintosh needed, and it would be the foundation of the Mac OS henceforth. Some critics, including Bill Gates, noted that Apple ended up not adopting the entire NeXT operating system. There’s some truth to that, because Apple decided not to leap into a completely new system but instead to evolve the existing one. Application software written for the old Macintosh system was generally compatible with or easy to port to the new one, and a Mac user who upgraded would notice a lot of new features but not a whole new interface."

Isaacson, Walter (2011-10-24). Steve Jobs (pp. 365-367). Simon & Schuster. Kindle Edition.

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lacking in technical knowledge, definitely; but your characterization of it is absurd.