In a massive twist of irony Alan Kay worked at Xerox PARC...!
Alan Kay's DynaBook still couldn't escape from the keyboard. Steve's vision is to solely rely on human interaction. No keyboard, no mouse, no pen.
After seeing the iPhone, Alan told Steve that Apple should build a 10"x8" pad and it would own the world. But he didn't know that Steve was already working on the iPad.
The Xerox Parc computer was also half done. It had an expensive $100 mouse for the professionals. Apple developed a $15 version for the masses. The Xerox UI was just a white screen with non-overlapping windows. The Mac has overlapping windows from day one, a complete desktop metaphor with desk accessories and trash can.
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For completeness, be sure to list Apple's monopolies.
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Please list Apple monoplies. Android has larger marketshare because it's cheap.