This is just a very rough enhancement idea, but could something like a picture entity card be created with the spotify playlist artwork as the picture and a playlist selector that sets the playlist ID to a text Input entity. This was automations could be set up to start playback with the URI that appears in text_input.some_entity and the playlist used in that automation could be easily and conveniently configured from the lovelace UI.
This is just a very rough enhancement idea, but could something like a picture entity card be created with the spotify playlist artwork as the picture and a playlist selector that sets the playlist ID to a text Input entity. This was automations could be set up to start playback with the URI that appears in text_input.some_entity and the playlist used in that automation could be easily and conveniently configured from the lovelace UI.