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I suspect that would just have set the bar too high. Unrealistic expectations are not good for devices in really early stages.

I think the presentation at Google IO was perfect: it was something obviously completely achievable now with the exact technology they had. And it was pretty cool.

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In general, tech companies probably shouldn't do any preview videos at all -- they should just show a product demo when it's ready.

I do think a video like the one described in the link could be done in a way that it was clearly so far in the future that everyone would know it was an imagination thing, like the concept cars at auto shows, that could turn into a real product in 5-10 years. And it would be worthwhile to get people thinking about augmented reality. But those kind of far-off concept promotions are really hard to do well.

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