> And inheritance naturally suggests grouping interfaces into a tree in the way that seems of little value because in practice a tree probably doesn't represent

> And inheritance naturally suggests grouping interfaces into a tree in the way that seems of little value because in practice a tree probably doesn't represent the fundamental truth of things. "This doesn't represent the fundamental truth" does not imply "this has little value". Your navigation software likely doesn't account for cars passing each other on the road either -- or probably red lights for that matter -- and yet it's still pretty damn useful. The sweet spot is problem- and model-dependent.