it was Bill Gates who envisioned a graphical desktop environment. .... Look this stuff up if you don't believe me,
Read the Road Ahead? That was written by Gates! I suggest that instead you read the Encyclopedia Britannica:
The Lisa and the Macintosh popularized several ideas that originated at other research laboratories in Silicon Valley and elsewhere... In 1968, as a researcher at the Stanford Research Institute (SRI), Engelbart gave a remarkable demonstration of the “NLS” (oNLine System), which featured a keyboard and a mouse, a device he had invented that was used to select commands from a menu of choices shown on a display screen. The screen was divided into multiple windows.... Xerox built a prototype computer with a GUI operating system called the Alto and eventually introduced a commercial version called the Xerox Star in 1981...
Note that 1981 is the year that Apple *started* working on the Mac. Bill Gates was 13 when Englebart was using a mouse to navigate from window to window on his computer.