Why do I need Roon?

I used to use amarra, pure music, and lastly audirvana. Roon surpasses them all for functionality and SQ. DS Lightning from Auralic and the LUMIN software would come in 2 and 3 behind Roon.
Roon provides such features that would, behard 

Roon provides features that would be hard for other vendors to implement for a free app. If you pay for an app specifically rather than a part of a product, you have the luxury of hiring more software developers that can tackle more features.

I looked for a long time for a useable way to access the digital portion of my music library. Before Roon, the nicest software I found was the Aurender, which required a sizable investment in hardware. I really did not want to commit to a closed system. The Aurender hardware is very, very good, but I hope DACs and streamers continue to evolve. Roon allowed me to not only find my music, but to grow from a NAS, to an old PC laptop, to a Nucleus at the front end, feeding my DAC. To my very great surprise, the Nucleus, as endpoint, feeding my Ayre DAC, has world class sound quality! In my estimation, I'd need to spend $5750 for a DCS Network Bridge, to improve the sound quality of my streamer.