In reply to Richard Bergsrud.

It's not surprising to me, but the American narrative often suggests that our built environment (in this case, our homes) transparently reflect our individual tastes. I.e., that we live at certain densities because we prefer them.

On the other hand, once you start saying that densities and architecture are a consequence of our transportation system, the illusion of preference and choice starts to seem more complicated.

Anyway, that's why it's "surprising."