I for one have never called Roon a "must have." I agree that it's more about music management and for me, with ~ 500 CD's ( I don't remember, don't count them) plus Tidal plus favorite Internet radio stations I find the metadata management and integration with Tidal just outstanding.
Yes, I can listen to all of my Peter Gabriel tracks, but I can also bring in music I don't own, or I can start listening to 1 artist and end up discovering lots more.
I also really like the DSP capabilities, and multi-room synchronization.
That's what I think it brings and makes a subscription worthwhile for me, but would I try to upsell it as THE feature you must have? Nah.