I'm not sure what you are referring to here. Listening to your own music in the macOS Music app is as simple as dragging (importing) the music into Music.app and selecting any of the options ("Recently Added", "Songs", etc.) in the Library sidebar.
Most media players I've used work like that. The application reopens where you last left off, so it is not like the Apple Music "Explore" or "Listen Now" page is shown on every launch to push the service on you.
I think the complaint makes sense in relation to the Apple Music sidebar items, but considering that there are users who want to use Apple Music, how would you surface it without having an easily discoverable item in the sidebar? I think having the option to hide it would be enough to alleviate it, but apparently one cannot, so that's a point against Apple here.