If all you want is a lightbulb that turns on/off, sure, it's totally an option to do at the switch!

Most people getting into smart lighting want more than that though, and are using products like Phillips Hue to do different colors/temperatures, save lighting profiles for different activities: watching movies, playing video games, just hanging out, cool christmas party lights, synchronizing lighting throughout multiple rooms, making it match your music, all sorts of stuff. At that point it becomes more of a decorative hobby than just "lighting your house" as a goal.