Hello here
For me it’s more a bug than a feature but I couldn’t find where I could report au bug. It’s an issue that seems to exist since 2017 according to this topic : Managed users cannot delete or edit playlists they created
The problem is that when a managed user create a playlist, he can add content to it but he can’t edit or delete the playlist, it’s very very problematic and frustrating for my managed users.
Would it be possible to fix it please ? 
Thanks to the team, keep up the great work! Really, this service is really amazing, now i’ve tasted it, I couldn’t live without it…