Cutting-edge technology was once a de rigueur residential amenity for any eight-figure listing, along with elaborate home gyms, zero-edge swimming pools and 12-car garages. It’s becoming nearly impossible to find a fridge, toaster or LED light that isn’t Wi-Fi-enabled or voice-activated. But the fully loaded tech compound is suddenly falling from favor as high-end homeowners frantically reset the password to escape the $100 billion home-automation industry. “Just like the arts-and-crafts movemen...