With PROPER DPI scaling, you can get super sharp (retina-speak) text and lines on display, because you can make use of excellent high DPI fonts and sub-pixel rendering to create text and lines that appear to feature no cusps unlike lower resolution displays. All this is done at NATIVE resolution of the display, the effective displayed content is less than suggested by the resolution of the display, but you gain enormous sharpness (such that at the reading distance your eyes are unable to discern pixels or effects of spatial quantization). This makes reading text (especially smaller fonts because they are subjected to more relative quantization) and vectorized images/art a lot more enjoyable and easier. I believe this is what a lot of people who have never experienced proper DPI-scaling have trouble visualizing. The best analogy is to think that you have enough GPU power to always use the highest setting in anti-aliasing on a 4k display, such that all lines, text and borders of any game are razor sharp and you are unable to see "jaggies".
I have only had the chance to use Windows 10 + 4K screen once earlier this year and I found that many applications (even those that came bundled with the laptop) did not scale properly. This is in stark contrast with OS X, when all bundled applications scale properly and just about all applications since late 2012 (when the first "Retina" Macbooks came out) have scaled properly with razor-sharp text and lines. Even earlier applications are handled by OS X properly (if it isn't high-DPI aware, the OS apparently renders it as if it was viewed on regular-DPI screen), you don't get the benefit of the razor sharp text and lines, but it certainly is properly sized on the screen and usable versus the super-tiny fonts of applications in Windows 10.
By the way, I did not appreciate your insult about me having more money than brains. Let's refrain from stereotypes and applying it to members here, who are trying to make a contribution to the thread.
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