I was thinking the same about ROON and other library management systems of your 'own' music.
I use Roon 80% of the time to play my own music. I suspect that's the case for most Roon users: it is a very good way to access and rediscover things you already own. I have Qobuz as well and use it to explore music I don't have. If I really like something I buy the CD or the download. Music streamed via Qobuz never sounds as good as locally stored files. Not to me, or on my system, at least.
So I doubt that Apple's new HD streaming as a threat to Roon or other library management systems. If you didn't want to index, explore, and play your own library, you wouldn't consider Roon. If you only wanted to stream music, you could have been using Tidal (and now Qobuz) for a long while. Apple doesn't add much to the mix that I can see. Even though I use Macs, iPads, and iPhones, I gave up my Apple Music subscription. If I really want to stream something, I can stream Qobuz as easily as Apple Music on any device.
What I like about Qobuz is a) no MQA and b) a good balance across genres. Apple Music heavily emphasizes top 40 stuff with superficial treatment of everything else.