Why would I need Roon?

It has sort of been mentioned here but I want to make it clear what I think is the greatest advantage of Roon is that it is ONE consistent library/interface for ALL of your music whether from streaming services or files on your hard drive or rips in your streamer.

Then... controlling/playing to multiple zones (roon endpoints) in sync.

@big_greg Whoah! Now thats  a lot of text and acronyms on one website! I have no idea what they are talking about.  I’m afraid BubbleUPnP is way over my head and I’m paying for the privilege of staying dumb by using Roon for the same reason I have paid for my Apple products all these years. I bought the lifetime subscription within a week of the trial period.
Dumb is also why I can’t go for any of those, supposedly superior, raspberry pi products and just shelled out my dummy tax for a Bluesound node 2i. I wish someone bundled those pi products up with an easy to understand list of features like an ordinary consumer product. The bluesound node is overkill for what I need. I just want a high-res Roon ready “airport express” with one Digital and one rca and/or XLR out.