COCustomWhat you suggest is fine.. but consider this: some people don't want to listen to music on their phones.. audio playback is an additional drain on the phone's precious battery life, phones are full of annoying interruptions, and DAPs can hold more audio files overall because they don't have to allot memory to other files, like to photos and apps .. Also, some people like to connect their sources to amps, which is more convenient and less cumbersome to do with DAPs than it is with phones -- which still have to be used as traditional phones and don't have line-outs or balanced outputs and, increasingly, no headphone jacks either (some people don't want to use bluetooth headphones for numerous reasons ),