It's not what you see that counts
> ever higher pixel counts, an approach that disregards how we actually see moving images
... it's what you can sell.
Let's face it, while some people sit close enough to their screens to make high definition worthwhile, most don't. Just like most people don't watch TV or media players in a perfectly darkened room, so specifications for contrast ratios are irrelevant. Likewise for pretty much any other specification-led consumer product: cars, hi fi, computers, cameras, phone and the list goes on.
The problem is that you can't say or show yer average consumer a "better" product and just have them see/hear/smell/taste/feel that it's better. If you're lucky they might just recognise that it's different, though since change is often unwelcome or even plain bad <cough>3D</cough>, that's a double edged sword.
No, it's far better to bamboozle them with figures - occasionally even relevant figures - of real or imagined origin to "prove" that your product is better than the other guy's/ Luckily scienec and technology education is so mind-numbingly bad that only a tiny fraction of the population has any chance of knowing what a specification means and almost nobody, anywhere, ever (though I did work for an electronics company a long time ago -one of the engineers took his stereo amp back to the shop after running bench tests with our mil-spec test gear) has any chance of validating those specifications.
Although tech-specs aren't the only way of persuading the public. While some credulous techies might be taken in by the babble that accompanies them - and is often promoted by magazines and articles in their reviews - most people just get hostile when confronted by pages of meaningless numbers. For them the solution is just to wrap up the goodies in an attractive enclosure - or failing that, a shiny cardboard box will do.