I'm now using spotify for a while and the feature I miss the most is the possibility to filter by followed artists.
By default, when you add a title, the artist is automatically added to the Artists pane.
So, when you want to follow a specific artist, he is lost in the crowd. It is impossible to know which artist you really want to follow and which have been automatically added : a simple filter will do the trick.
I know that you have done something similar recently for the album pane and it is great !
I wish you the very best for this incoming new year.