The music app can handle your music the same way iTunes did without you needing to subscribe to Apple Music and Apple TV+ isn't advertised in the OS. It's just an app that you never have to open if you don't want to. Such minor things to complain about.
Exactly, I actually prefer the Music application above iTunes now, especially if you go to Preferences -> Restrictions and disable Apple Music and the iTunes Store, suddenly it's a very nice music manager and player that doesn't nag you about buying or subscribing to things at all. I also have never ever seen advertisements about subscribing to Apple TV+ by the way, the app is there but if you never use it you'll never notice it.
Also, Catalina runs great here, I have no idea what everybody is complaining about.