I'm a regular user of the Discover Weekly and Release Radar playlists. I have spotify set to only use data on wifi. However, every week, when the above playlists change, it deletes the offline copy of the playlist and tries to download the new one. However, I usually discover this in my car, when I can't download the playlist due to being on cellular. This is pretty user-hostile.
My request: please do not delete offline copies of playlists unless they can be replaced immediately according to the current settings.