Good post, my thoughts:
In the short-term, Apple Music will be a tremendous value to consumers of a specific age who have not amassed a decently sized Library of downloaded music. Many of the posters in this thread fall into this group and I get why they like it so much.
But in their long-term, Apple Music will invert itself and become a needless monthly expense and something they will regret. Like the Columbia Record Club or even the halcyon days of Napster and Limewire, you go through that first week of joy taking 100s of songs offline from all the classic artists you wanted, all those old hits from junior high school, all the stuff your friends always raved about, it's high-times for Apple Music and you love it. "All this for $10? Wow! Thanks Apple!" But by the 2nd month you realize that all the cool offloads are over, you have everything you ever wanted, and now you're stuck in a business model that requires you to keep paying to rent something you otherwise could have bought. And as the years go by and you listen to Flock Of Seagulls less and less, you realize you're paying a lot of money and you're not really happy with the new releases and are bored of the old archive and you're back in the same no-man's land we are in right now.
We went through this already. The year after Napster, we all had this withdrawal. It's down to 2 or 3 albums a year and a few singles, you don't listen to The Doors more than once every 5 years. So you listen to the radio because it's fresh. And radio, terrestrial or iTunes, is free.
BJ