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What would you call it, then? There are plenty of books out there that weigh 3lbs, and some that last 6 hours on a single charge (or even 10 hours with a 2 battery design). So, this being near the top of the spectrum, and also having limited portability due to battery life, what the heck is it if not a desktop replacement?
In my mind:
ultraportable= 4lbs and less
thin and light= 4-5.5lbs
desktop replacement= 5.5-8lbs
greater than 8lbs, I think, is a marketing mistake, as you'll almost certainly be better off with an SFF.
Or do you just get a kick out of being contrarian?