More and more people are working from home. After the initial fun of wearing pajamas while at your desk wears off and you actually get dressed for real every day, then the thought of client meetings comes to mind.
You want to keep your privacy even when clients come by to discuss a project. Why not have a separate entrance specifically for them?
This house allows the front porch to be dual use. One for family and friends that come over, but also for clients that are popping by for a quick chat. Such convenience!