I just have a major issue with it UX-wise. I wish podcasts and audiobooks were their own separate apps. I've totally given up even trying to understand Spotify's UX anymore. I always eventually manage to play what I want through some combo of scroll/filter/search/history but I just feel like I never know what's going to appear anywhere this time.
And as long as I'm wishing... how about an app just for classical music too! Composer+performer just can't be satisfactorily shoehorned into a single "artist" field no matter how hard you try. Same as tracks aren't works -- a symphony might be anywhere from 3 to 40 tracks. (Keep classical music accessible in the main app for casual listeners, and because the line between classical and pop is blurry in some cases -- but just add a dedicated app designed for classical alone.)