Bodies are not obsolete by any objective standard, but they increasingly are perceived as too slow, frail, and unreliable for our expectations and desires—as parcels to be transported by mechanical means (though of course many steep, rough, or narrow spaces can only be traversed on foot, and many remote parts of the world can’t be reached by any other means; it takes a built environment, with tracks, graded roads, landing strips, and energy sources, to accommodate motor transport).
