I think the clickwheel design is, in my view, the single best one-thumb no-looking-required input scheme for an MP3 player I think anyone has ever made. Plug it into, say, my car stereo AUX port and I can pick it up with a free hand to control volume, select tracks, and even navigate mostly by memory without having to look at the thing. I can just tell where I am based on the feel of the control. Infinitely better than a featureless flat slab of a touch screen that gives you no sensory feedback.
can’t most of these things be achieved easily by physical buttons too? of course everything is better than touch screen buttons