1:1 pixel mapping - what is it for?

1:1 Pixel mapping means capable of displaying a digital signal transmitted at its native resolution without scaling the image.
 
You'd think it would be easier than scaling it, really.. surprising it's not a universal feature.
 
In other words, if you feed 1920x1080 (standard for high-def devices) to a 1920x1200 display, it will show the image at 1920x1080 (by filling the extra space with black bars) rather than stretching to 1920x1200.
 
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