I was oversimplifying because my post was only in response to this utterly bogus base claim:
Without the basic idea of a GUI... which was not invented at Apple.., the later refinements added to the GUI by developers working at Apple and other places could not have existed.
It's like claiming that someone who invented the pushbutton car radio or lighted gear indicator is also responsible for the invention of the car.
I am quite aware of the differences between the Alto and Star, Lisa and Mac. I wrote a couple of GUIs (in assembler) in the '80s myself.
Mine had some worthwhile improvements as well, such as multi-tasking (i.e. windows could continue to update while one was being moved), background pixel and text storage, built-in knob and slider controls for touch, etc.
However, making such refinements doesn't mean I invented GUIs, any more than Apple did
Regards.
While you may be aware of all this, not everyone reading your your comment was, and could be lead into thinking that Apple literally copied Xerox and simply added pull-down menus, which is not true. The screenshot you posted could easily leave that impression. That's why I felt it was important to mention some of the differences which can't be seen in the screenshot.
Have a nice day!