Just checked out the updated app. ALL playlists are still there. I do like Amazon playlists better than my Apple Music subscription. I only have this because I wanted the 2TB One plan, and we semi-regularly use Fitness.
spotify has excellent playlists, the g/f subs for this reason.
My curated music of my own still live untouched via iTunes Match, and yes I double dip in paying for Match & Music, a process of moving my Match stuff to my own NAS is currently being researched.
I understand the concept of curated playlists by third parties, and I find myself using them from time to time, otherwise, I would never actively search out a new music. Kinda set in my ways, but I’ll take access for free any day, to expand my listening.
They key is of course, that we actually use on a weekly basis, Amazon prime, so this works well for us.