Why would I need Roon?


I have a Blue sound streamer with plenty of files at my fingertips, via a hard drive plugged in the back and multiple streaming services. Can someone help me understand what Roon would add to my set-up? Thanks. 
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I would not consider a Room subscription - I got lifetime, and I’m old;)
All the above regarding interface, radio and SQ is correct. UPnP stuff is awkward & ugly, I rarely played music when I depended on those. Also, the truly transcendent DACs from Ayre and DCS are Roon endpoints.
I bought Roon for one reason: crossfeed for my headphones. (I do like the way it organizes my music, though.)