Suppose we got to the point where we only got around on segways. Sure, we still know how to walk, in theory, but we rarely do so. Now imagine that there is a physical education course that requires actual walking and other forms of self-propelled locomotion. The students howl in protest that they must leave their segways at the door. Surely the instructor does not UNDERSTAND that modern technology has made walking all but obsolete. But maybe the very point of the class is to introduce a way of getting around that strengthens the muscles of the legs.
The final exam in the course involves some self-propelled locomotion. Some of the dumbass students, however, hide their segways in the bushes. After all, the professor's requirements are absurd. In real world they will never be asked to WALK.