In a way, his work supports the work of UNIX and Ritchie. He states that tech work on a large scale is often like setting pavement. UNIX APIs are a progression of that. The fact that many can use a computer without understanding the underpinnings of an OS is a testament to Jobs.
Why is it a testament to Jobs? I doubt he wrote even a single line of code any of Apples OSs. Did he design the UIs or did he hire someone and then just approve what THEY worked on and designed?
I hate how people talk about Apple and give Jobs all of the credit for what Apple produced. What about all of the talented engineers, designers, etc. who actually did the work? Sure he had final approval and his design taste and whatnot were important factors, but he would have had nothing to approve or chose from if all of the brilliant employees didn't produce the work.
Yeah - every tech company with talented employees produces results that are just as good. Management and CEO talent is irrelevant, as we can all see. Jobs deserves only contempt.
You can just look at Apple design pre and post Steve's return just to see how big an impact having him around had. Suddenly Jony Ive had someone to play ball with.