Home automation is not just about 'clap on / clap off' bedroom lights. A good home automation system has many aspects that are not noticable by the occupants, things that you don't notice until you move to a new house that doesn't have a system. Occasionally you do need your house to give you information before it does something, and doing that in a smooth way is important to keeping the system 'in the background.'
One of the tasks I've given my system is to shut off lights that are not in use. There are three sets of lights that would frequently be left on by a certain-someone that lives here who isn't as concerned about wasting power as me. There is a light in the entry way (right inside the front door), there is a pair of lights at our pantry (one inside the pantry, the other outside the door, both on separate circuits), and then the main set of kitchen lights.