To give credit - Apples human interface guidelines for the original Macintosh were wonderfull in giving guidance where the UI as a concept was bound to be forei

To give credit - Apples human interface guidelines for the original Macintosh were wonderfull in giving guidance where the UI as a concept was bound to be foreign to most. Also, the first commodity GUIs were on resource strained hardware so they could not do everything effectively. I think we are now at a point where the glowing animated screen is far more familiar to most people and the raw power available on most devices is such the only rational constraint for UI design is that use experience must be understandable to most and that the underlying system must play nicely with rest of the device.