Earlier quoted context omitted.
> The good news is that Spotify's SDK and API are actually powerful enough that you can build up an entire alternative interface In most big web services, actual functionality in the API normally seems to leads to its eventual deprecation. Will be interesting to see how this one plays out.
Didn't they deprecate libspotify the other day?
With some caveats though as I mentioned in another comment. Their API for controlling playback doesn't work well with Sonos players for example.