So you think there's been progress in GUIs since 1981.
digibarn.com
digibarn.com
There is more to a GUI than the screenshot, there's also the actions associated with executing operations in the GUI. Consider the PC-GEOS vs. Windows of the time (2.x or 3.x, I think). GEOS was lightning quick, and a good deal of thought had gone into the interfaces for the major tools. The same machine that would run GEOS so sprightly would crawl under the iron heel of Windows. The interfaces looked very similar, but the quality of your interaction with them was entirely different.
So yes, there's been progress -- unfortunately, a lot of it has been backwards!
Love the attention to detail.