The goal of consumer tech development used to be pretty simple: design and build something of value to people, giving them a reason to buy it. A new refrigerator is shiny, cuts down on my energy bills, makes cool-looking ice cubes. So I buy it. Done. A Roomba promises to vacuum the cat hair from under my sofa while I take a nap. Sold! But this vision of tech is increasingly outdated. It’s not enough for a refrigerator to keep food cold; today’s version offers cameras and sensors that can monitor how and what I’m eating, while the Roomba could soon be able to send a map of my house to Amazon.

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