i recently heard on a podcast that smartphones are bad as music players because they are very distracting. especially for athletes. a single notification or message can lower their performance for minutes. music on its own can however boost performance.
as most mp3 players are moving to using android as their main OS and requiring wifi, location and whatnot, i have learned to appreciate the simplicity of the first few generations of mp3 players. so i really like what this project is doing for some reason.