I was happily paying $10/month to Spotify but canceled my subscription because the desktop player was so bad and incomplete. After a while I realized that attempting parity with other players was not on their to-do list.

I'm not even a power user, there are many advanced and obscure features of Winamp/foobar I never used. But those products have the nuances of day to day management of playlists and usability figured out and Spotify in comparison doesn't care. It seems they'd be happier to have you use web/mobile and not even support a desktop player.

Foobar2000 my friend