This reminds me of when iTunes Match first launched and I subscribed to it on day one or close to it I think - I was definitely an early adopter of it. I was looking forward to having my library matched with what was in the iTunes Store, or if that wasn't possible then having my non-matched music uploaded, so that I could then stream my music to any of my devices. One of the chief features for me was not needing to have my music be local (on device) for me in order for me to listen to it. HOWEVER , I discovered in short order that 'Match' really loved playing with my music's metadata on my computer - the usual wrong album art, or albums being split up into two or more separate ones, among other issues that I had. So, I ended up turning Match off a short while into my years subscription of it, and then I went into my account in iTunes to turn off the automatic renewal option of it as well. This was my experience of it only, YMMV. However what I'd like to see, but am not sure how easy or doable it might be for Apple to implement is some sort of dialog box, or menu selection that says something to the effect of 'prioritize local/library metadata.' Some option or selection that would tell Apple Music/iTunes Match to essentially leave a users local library and its' metadata alone.