Yes. To engineers, the interface is something you use to interact with software. To users, the interface is the software. When they buy (with money or creepy an

Yes. To engineers, the interface is something you use to interact with software. To users, the interface is the software. When they buy (with money or creepy analytics for marketers) software, they're buying an interface. As anybody in business knows, you're not in the business you think you're in, you're in the business your customers think you're in, and if they expect software to behave in a way it can't, their competitor is a half-inch down the app store results/google listing/etc.