Animals this size are more efficient for small farms, they are far from useless. They don't take as long to mature and harvesting one should render a few weeks worth of meat to throw in the freezer. Being smaller also means their hooves will do less soil damage. They are advocated for use in
permaculture
The downside is a karmic/ethical one - it means snuffing out more mammalian sentience for a given amount of meat. Not that this bothers many people...