It's so hard to find my playlists or when they were created, it'd be good to be able to rearrange the order or have a category system (like folders which someone else has mentioned). Also, being able to duplicate a playlist or combine playlists into a new and seperate playlist. Being able to pick a song and seeing which personal playlists its included in would be helpful too.
Updated on 2020-01-14
It's better to post each suggestion in it's separate thread. That way, users can vote on each one of your ideas.
Playlist folders are already available in Spotify. In the Desktop app, right click in the playlists area, and you'll find the option to create a playlist folder. Once created, you can drag and drop playlists to the folder for better management.
For more info on how the Ideas Board works, click here. 🙂