One set of my grandparents had an expansive, well-cared-for yard with a swing, arches with climbing plants, secret little gravel paths through the trees lined with mosaic tiles featuring the likenesses of their grandchildren, a picnic table, a patio with a barbecue, and so on. I think if you want to have a yard like that, it is a fine hobby. But most people do not. Most people just have a grass rectangle that is a liability. My father has lived in the same house for 15 years and has never used the back yard except as throughfare and has never used the front yard for anything. You can't even see it yard from outside because of an eight-foot-tall fence. All he does is mow it - what's the point of that? It's pure liability. And I think this is how most people's yards are. And that's silly.

I've lived in a few row houses with fully paved outdoor areas. I don't really see the point of that either, but at least it doesn't require regular maintenance so it only has to be occasionally useful to come out ahead.