I NEED flac support. An important percentage of my local audio files uses this format and it's a pain switching between players just because Spotify won't support it, is it really that difficult to make it happen for an audio software company? Come on.
I think the Spotify response is kind of weird: "At the moment, flac is still a relatively uncommon format." I honestly cannot find any other lossless format that is more popular -- either in the enthusiast community or the commercial online sale of music community.