There’s always been something aspirational about the term “smart home.” It was coined by a residential builder association here in the U.S. back in the mid-’80s, long before the inventions we now think of as hallmarks of the smart home. Today, 42% of American households with internet own at least one smart home device, according to the market research firm Parks Associates. In her new book, “Threshold: How Smart Homes Change Us Inside and Out,” Heather Suzanne Woods of Kansas State University asks whether that’s a good thing.