Time to throw in an element that unambiguously is out of date: widescreen resolutions. The aspect ratio that the human eye sees in is 4x3.3. This is why Edison used 4x3 film. Of course, some of you are going to object, and to preemptively answer your your objections, do a quick experiment: stare straight ahead and raise your fingers vertically, holding one in front of each eye. Still looking ahead, slowly move your fingers away from each other. See how far apart they can get before you can't see them anymore. It'll probably be about 180 degrees. Now move your fingers horizontally in front of your eyes and move them vertically, again seeing how long you can see them; this'll probably be about 100 degrees. From this, you would likely deduce that the human eye sees at a 1.8x1 aspect ratio. It doesn't. That's the light that enters the eye, but since peripheral vision is nowhere near as good (that's why it has its own label, after all), it's hardly appropriate to count it the same way; you wouldn't drive with peripheral vision, after all.
So why the switch? Back in the 50's, movie theaters were losing business to televisions, so they needed something to pull people back in. Pressure was applied, and directors began shooting in widescreen, adding an advantage that TV didn't have. The people of the 50's being just a stupid as they are today, they went whole hog for it, and television followed suit a few decades later, monitors a little after that. Of course, this means that sizing monitors by their diagonal doesn't mean a damn thing anymore, but it doesn't change the fact that you're all chasing around an increasingly ludicrous half-century old publicity stunt.