The point is: unix model state "desktop systems are too costly and complex, KISS, we just need to give users ability to chain some small programs together to ma

The point is: unix model state "desktop systems are too costly and complex, KISS, we just need to give users ability to chain some small programs together to made most of the jobs, thanks to simple and powerful IPCs", GUIs can't be Unix models since their only IPC is cut&paste. Document UIs can be, but my limited knowledge of historical Unix GUIs do have some "document UI" aspects (i.e. SUN NeWS/Display Postscript) but they aren't much Unix nor much documents. Those who developed Document UIs was Xerox, Symbolics etc...