The time period covered by the book (1998-2015) is significant. This is Ive telegraphing the end of the Jobs roadmap. "from 1998’s iMac to 2015’s Apple Pencil" which is very much in line with the following Jobs quote of pre-iPhone prototypes. "I had an idea of a multitouch display that you could type on. About six months later they called me in and showed me this prototype display. This was in the early 2000s"