I worked for Xerox for over 30 years, almost all of it outside the copier side. That includes being on the sort of ground floor of the trying to productize of all those Xerox-invented technologies from the Palo Alto Research Center (PARC) that underlie today's technology. All the basics --- icon-based interfaces, point and click, page description languages to drive laser printers, laser printers, mouses, integrated applications, etc., etc, etc. I saw all that stuff when it was engineering models and bread-boards.
Not to be rude, but Jobs didn't invent shxt! What he did was co-opt, borrow or steal (depending how you look at it) all the technology that Xerox invented. I'd say that Jobs was clever, but not particularly super-intelligent. All he was doing was doing what the Japanese did for a long time. Find someone else's concept or design and make it cheaper.
Now that's not to say Jobs wasn't a genius but on much more mundane stuff. After being given a demo of the Xerox Lisa product, he recognized its potential and knew how to make a cheaper version of it. That's it!
Maybe, if he hadn't fried some of his brain circuits with LSD he could have invented something himself?
Xerox never figured out how to make anything inexpensively. Xerox thought they could sell worksations for $14K (1980 Dollars)Jobs with his background with the Apple and Apple II knew about to design cheaply for high volume production. He also realized that if the Mac could change the operator interface from command-driven to Icons, that would change the world. So he cost reduced Xerox Lisa, defeatured it and made to sell for less than $2000.
Jobs is the face of the computer revolution for many.