Hello,
in the "add to playist" menu you can add a song to a playlist -- and remove it -- by ticking it's name
I use deezer a lot, and i have a lot of playlist, for several theme, ambiance etc, but managing in wich playlist is a song it's get really fast really annoying, so imagine when you listen to a whole new set of new music ald you want them all ? you spend more time to manage playlist than listening to music, and don't even think about something, my idea is simple :
everything become easier, faster, less frustrating and doesn't discourage you of adding musics to your playlist, spending 30 seconds for everyone is so tiring, and i don't even mention if you missclick and have to go all the way through your playlists, then alk the way to all the musics to remove the good one...