Does anyone know what the point is of wasting floor space on a porch when the actual interior is so small? Seems to me that type of floor space that is only som

Does anyone know what the point is of wasting floor space on a porch when the actual interior is so small? Seems to me that type of floor space that is only sometimes useful would be one of the very first things to go. I love seeing these cool concepts for tiny houses, but why not use every available bit of floor space?