Not sure I can explain this but let’s give it a shot. Raise your hand if you’re old enough to remember “collecting websites.” This was back in the early days of the web and long before Google made it easy to find your way back to a favorite site. Bookmarks were an important part of your web browser. It wasn’t uncommon to have dozens (hundreds?) of bookmarks. So many you needed a folder structure to keep them all organized. I don’t know many who still maintain such lists. Modern browsers do a pretty good job of keeping up with your favorites sites based on your surfing habits.
I’m seeing a similar evolution in my music listening habits. I still have some playlists I created in iTunes. These are lists of songs I purchased and downloaded. Or, more recently, just downloaded from Apple Music. But I’m finding it increasingly cumbersome to navigate these lists when compared to the way Apple Music connects me to music. Where my playlists are static (the same songs), Apple Music playlists are updated with fresh songs. I don’t know if this is true of all playlists or just some. But the result is a fresher, more dynamic experience. In some ways this feels like listening to a good radio station where the music rotation is the best blend of favorites and new stuff like the favorites. I told you… difficult to explain.
There are some classics I’ll always want to keep close (Mad Dogs and Englishmen, Harvest, Tapestry, etc) but I’m feeling less need to organize and manage “my” (i.e. downloaded) songs. If I’m in the mood for some funk or a Janis Joplin song Apple Music will deliver the good far better than my collection. My downloaded library is finite where Apple Music is infinite but increasingly aware of what I like (or might like).