The middle ring gets improved because when you heart an artist, the larger number of albums from the artists you have favorited then gives a stronger weighting in the algorithm to similar and related music.
Also, happy you noticed we cleaned up the issue from v1 where playlists would spam your collection with artists that only had a single track.
Playlists work VERY well now. Definitely give them a second chance.
Pro tip: If you have Deezer Family, try putting the primary account on the Moment, giving the secondary accounts to family members, and then hearting the 'loved tracks' of each secondary accounts. The Moment then shows the Loved tracks of each family member, with their names below. Whenever a family member hearts a new track on their personal devices, the track is added to the Moment under their own playlist, the playlist tile updates its 'slices' and everyone in the family will then have instant access to their favorite music and music discoveries. This also works great with the 'double tap to shuffle' feature. Since we added this feature it has really changed how much we talk about music in the family, seeing as we can easier put music on for each other etc. It brings back the feeling of the family having a music collection again.