Let me know if I'm missing something, but when I'm offline (i.e. riding subway) the only way for me to listen to my downloaded music is either by shuffling playlists (that might have a downloaded track or two), scrolling through my music looking for little green arrows, or going through 3-4 actions to filtering my library by downloaded content only.
IDEA: Lets add a "Downloads" or "Available Offline" playlist/tab/section to the Your Library part of iOS app so I can just go right into my offline music listening experience.
I swear that had this in one of the app versions a while ago but seems like it disappeared.
PS - I'm also finding pretty regularly that the app gets hung up when navitaging offline. Anyone else notice that? I'm on iPhone 7 with latest iOS update (Feb 2018).