You're too old. You play albums. You're probably playing one now.
I play albums too, but I have a selection of smartlists in Car Radio which either play random albums, shuffle albums from my favorite artists, or play random albums from a selected genre.
Using it for static playlists doesn't really interest me.
Perhaps a feature where clicking an unused Car Radio button would prompt you to enter an artist or genre, and have it automatically generate a smartlist which does that might increase the feature's popularity.
Some way to quickly undo accidental clicks of the Car Radio buttons would be very useful too.
And an annoyance of mine has always been that the buttons are above the splitter instead of below it, so they remain visible when you hide the playlist. I would prefer not to see them at all in video zones.
While OT - it does raise the old "What do you use MC For" (feel free to move to a better thread). Our MC usage reflects wanting to have high quality Video Library (which you can not really get with streaming at any price).
That's the thing which got me to use JRiver in the first place.
I was already happy with how I was handling my music library elsewhere.
I do now prefer JRiver for music playback too, but it has many limitations that prevent me from expanding my use of it (gave up on multi-room), and development for audio is not focusing on things that matter to me, so video is still the main appeal.
However it's starting to fall out of favor with the prevalence of 4K media, since 4K video crashes the player all the time for me, or if I'm watching a 1080p video and the audio analyzer runs at the same time.