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The larger question isn't faithfulness to "what the Air is" ... but rather... can each kind of prospective user find a suitable model?
There is a bit of a void for the relatively mobile worker or person whose mibile work includes "content generating".
Of course, all laptop makers exaggerate battery life. So the perfect Air buyer wants a full Mac O/S, great keyboard, nice screen, great Nvidia graphics... but they're never out of the office for long enough to run down the battery. Or they're OK with schlepping the charger around, and never far from the next outlet.
And they can live with modest memory, because their Air isn't a sole computer.
Such buyers exist... college students if they carry it around, come to mind. But the Air's combination of features and omissions may even fail the college student.
Hank Keys (sp?), a computer consultant with 30 years experience doing a computer radio show, says he sent his daughter to college with a laptop. It turned out that all the kids in the dorm had desktops,, because with 3 roommates and all their friends and acquaintances coming in and out... a laptop can get easily stolen. (And few students on that campus took laptops to classes.) But a heavy desktop wouldn't get stolen.
So... does the MacBook Air have a slot for a cable lock? No. It's so light that it might get carried around sometimes... but sometimes it'll be left in that dorm room.
The Air is like one of those old sports cars whose peculiar mix of features and omissions would elicit a reaction consisting of all of the following: "Great. Super. Nice! Oi. Ahhh. Beautiful! You gotta be kidding, they left THAT out?"
Jobs's policy of -- forget market research, my personal intuition on design will rule supreme." may have worked for certain products better than for others. IMHO the Air is this approach's least successful product, even though it simultaneously something launched as an innovation leader.
The history of design innovation is littered with very interesting designs that don't seem to have succeeded as much as they should have.
Upon closer examination, some of the failed innovations fell short due to "It had this, but it didn't have that", or sometimes it was not publicised much,, and most of the potential buyers never even knew it existed.
But the Air is now just a spec-bump or 2 away from finally -- being emancipated from its cramped memory specs. Double or triple the max. RAM, and double or quadruple the biggest available SSD, and keep the progress at least inching forward on battery life (last bump changed 37 watts to 40; let it gain a quarter pound for that)... and toughen up the case a bit ..... and IMHO they'll sell double, triple or quadruple the number of units they're now selling.
Apple is SO CLOSE to getting this product's design right... it's frustrating for a student of design and innovation to wait and wonder when they will.
Translation: I need it now (bad timing) so I'll get the best one available now... and years from now when I need another, the Air will be a super thing.