Apparently Sonos has forgotten that they have a great number of audiophiles (like you, myself and others) that have a vast collection of personal tracks that was on a variety of media types. Sonos seemed to be the centralizing solution that I needed to convert thousands of albums, tapes, CD’s and such under one roof. To me accessing these legacy tracks made Sonos the premiere hub source. Good thing I backed up those converted files on a network-attached storage drive, not to mention saving my legacy playback devices. I personally apologize to the hundreds of friends that I persuaded to try Sonos.
BTW, if it weren’t for the “dinosaurs and such” in the music and electronics field (like me, we wouldn’t have streaming audio. Sonos, fix this!