Very true. There are a few options in that space: Clementine (https://www.clementine-player.org/), Tomahawk (https://www.tomahawk-player.org/), Mopidy (https://www.mopidy.com/), Fidelify (http://fidelify.net/, not OSS), Soundbounce (http://soundbounce.org/). (Raise a glass to SOVND, my personal project that I killed when I got fed up with libspotify.)