It would be so so cool if spotify had a more "social" aspect of it where you could comment on your friend's playlists or just people's playlists in general. Maybe there could be a button at the top next to the heart where you can like it but instead one for commenting!!
It looks like your idea was posted a while ago but, unfortunately, it hasn't gathered the minimum amount of votes to stay active in the Ideas Exchange (50 votes in the first 3 months). I'll mark your idea as "Closed - Not Enough Votes". You can learn more on how the Ideas Exchange works here.