Favorite Roon Features / What value does it add for you?

I've given Roon a shot twice now. While it seems like a nice service, I don't think I can really justify the price given my current setup.

So, I was wondering: What are your favorite features, especially ones that may not be evident to a new user? What value does Roon add for you that keeps you coming back? I'm just kind of curious if I'm missing anything that could make a big difference to me. It seems like the software really does a lot, so I could be missing something.

A little about my setup... I have one main listening space with my nice audio equipment, where I use a Lumin D1. I have several other areas with smaller speakers in my house, where I use Apple Airport Express devices to stream music from my phone or computer.

I suspect part of the reason that Roon doesn't seem especially useful to me is that the Lumin software already does a decent job of integrating Tidal and my home music library. That, and a I don't own multiple high-end streamers.

It did seem like Roon was able to play music to the Lumin and the Airport Express devices in sync, which is something I can't do on my phone, because the Lumin does not have Airplay 2. Typically I can only play to multiple Airplay 2 devices in sync, the phone does not let me also choose Airplay 1 devices. Roon seems to be able to do that even though the Lumin isn't Airplay 2, which is pretty cool.

I can see Roon becoming very useful if you have multiple higher-end streaming devices in your house, which run on different softwares... you could presumably control all of them from the Roon interface.

The Roon album art/artist bios/etc. were cool, but typically I'm doing something else when I'm listening to music, like reading a magazine, surfing other places on the web, hanging out with friends, etc., so I'm not sitting there studying up on album and artist details.

Roon radio was decent... I would say it got closer to the type of music I like than, say, Tidal's autoplay or mix features.

So anyway, what do the hardcore Roon people think? What are your favorite features, especially ones that may not be evident to a new user? What value does Roon add for you that keeps you coming back?