Agreed. Apple, please, please, please address this in next update. Probably one of, if not THE biggest down side of the app. I use Apple Music, over say, Spotify because of the neat cross platform functionality for all of my Apple products (have for some time now). However, I've recently found myself seriously considering deleting my apple music and using Spotify in it's place, regardless of Apple's cross platform benefits.
As it stands, Spotify is a far superior music app to Apple music, but it doesn't have to be that way (and shouldn't) - there are many small oversights that I feel are the cause for this. Some very basic features could add to the Apple music experience, and help you retain at least one more customer - such as adding a 'sort' function to the playlist, and also a notification for duplications of any song that may be added to a playlist, would be a good start.
I'll refrain from getting into the 'why,' but take it from a self-proclaimed music guy. The lack of these two very basic features is detrimental to Apple Music's listening and curating experience, for one user at least..
Thanks.
PS. This is my first message on these boards - I apologize in advance for the rant, but I'm more surprised it hasn't been addressed already..