When it comes to home security, peace of mind and convenience are what matter to me, making a smart lock pretty damn appealing. We know that homes generally aren't targeted by burglars for a lack of obstacles, but for an abundance of opportunity (like an unlocked door!), and a smart door lock leaves one less thing to chance when you're away on vacation or at the office. All the locks in the world probably aren't going to stop someone truly determined to break into your home - so unless you're barring your windows and using solid exterior doors (and most US homes aren't), I don't think the physical security argument has many legs to stand on.