This is a tough call – do we bother to teach analog drawing technique in an age where the ability of the computer to produce potentially astounding images?
My feeling is that the act of drawing is more about the mind. Training in analog drawing is more about understanding the construction of space, and less about the application of an outmoded means of representation. It engages fundamental modes of learning: cognitive skills of knowing, understanding, application, and analysis; the psychomotor skills of perceiving, guided response, proficiency, and origination; and the affective skills of receiving, responding, valuing, and, one hopes, a change in character. And perhaps the specific skills are part of a dying art, but the meta skills, the discipline of thought, are universal.
I love the drawings of Jan Vredeman de Vries, a 16th century Dutch artist who wrote one of many treatises on perspective at the time. I came across a blog that has compiled parts of many such treatises. They are pedagogical, but he was clearly enjoying himself when he made them. I hope for that for my students. Drawing should not be a chore, but a release, a meditation, a joy.