I signed up for iTunes Match in 2011. Having my library/playlists in "the cloud" seemed great. Well, after it wiped out playlists, play counts and metadata I had since 2006, it sucked. It ruined it more than once. I figured one good fix and it would "sync" everything correctly, but smart lists didn't work (I rely heavily on them), play counts didn't sync correctly, and to this day, buying a song from iTunes on a Mac, listening to it, then downloading that song while on the go and listening to it doesn't sync play counts, even with manual syncing. You have to sync the same source to your other device for the play counts to sync.
I have not been brave enough to venture into iTunes cloud library. It never worked, and still doesn't. Apple Music is fine for streaming. I have a 12 year-old library of playlists and play counts. I won't sacrifice that again.
I'm sad to say iOS 6 - with Forstall at the helm - was the last, most stable version of iOS. Also, I think the skeuomorphic design helped. There are features in iOS I don't know exist because there are no indications. The life-like designs made navigation and new features easy to guess and discover. Who would think to long-press on the "Reader" icon if they hadn't read it somewhere? There's no indication. Maybe a thumb-print of a finger-print would indicate such features. I don't know, but really, while iOS IS impressive and a feature-rich OS, it needs work. iOS 6 was polished, stable and adding features. It's felt like beta since 7.