You're accusing me of thinking and saying a lot of stuff I never stated, inferred, or implied.
I'm not accusing you of anything; I'm responding to statements and questions you've directly posited, as quoted in my actual post. To wit:
Uhhh...it's a laptop built to be lightweight with great battery life.
Putting a nicer screen on it will likely affect both of those.
to which I replied
Even upping the 1440x900 TN panel to 1920x1080 will have no noticeable impact on size and a negligible one [on] battery life.
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But then his blu-ray rips won't be shown at 1080p! What will the neighbors think, besides "why are you bothering to watch an HD movie on a 13" screen"?
to which I replied
It's perfectly reasonable to enjoy FHD content on a 13" screen (or an 11" screen, for that matter), particularly if it is being viewed at a distance common to laptops of about 2 feet.
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What's the need for 1080p? If you want to watch 1080p movies, there are far better options than a 13" laptop screen.
to which I replied
And many people find multitasking in multiple programs/tabs easier with 960px-wide windows than 700px.
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Could you explain to me why 1080p is some sort of magical number for laptop screen resolution, please? I use my laptop for things other than watching video 99% of the time.
Also, 1080p has been an industry standard for a while - though admittedly that appears to be shifting - at least in part as it is indeed the native resolution for high-definition video and a long-standing sweet-spot for gaming resolutions and performance. Granted, these are not inherently the targeted uses for ultrabooks such as the Air or XPS 13. However, there are two inarguable facts:
1) 1920x1080 is a higher resolution than 1440x900 and
2) Some people prefer working with more pixels and/or higher resolutions
There are so many reasonable uses beyond consuming media. 1080p doesn't have to be a "magic number" as you've indicated, but it is of higher quality and provides more flexibility than lower resolution screens, whether you as an individual would or could take advantage of it or not.
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As Apple's scaling options only has the optimal performance at 2x, what you want will be a 2880*1800 display instead of a 1080p one...
I'm not sure I understand your quote. UI scaling can occur at any resolution - or at least it can technically; whether Apple or other hardware/software vendors support it is another matter entirely. The MacBook Pro actually has the ability to scale 2880x1800 to 1440x900, 1680x1050, and 1920x1200, which makes it incredibly versatile. It also does it quite well; the "optimal performance" or "best for retina" settings are for direct 1:2 scaling, which requires less horsepower. Nevertheless, it's not only possible, it's excellent. See this article for a little more info:
http://www.anandtech.com/show/6023/the-nextgen-macbook-pro-with-retina-display-review/6
Generally, I'm not advocating for retina on MacBook Airs. Personally (and despite my indication above that 1080p is not inherently a "magic number"), I do find 1080p my personal sweet spot on 13" laptops, and I share concerns that a high-retina screen will have a negative impact on battery life. However, I do consider the current 1440x900 and 1366x768 TN panels in the current Airs to be a tremendous compromise considering the Airs' cost, overall quality of build, and ranking as top-tier notebooks.