The Bluesound Node is Roon ready, meaning it can act as a Roon endpoint. You can not run Roon core on it, however. You will need a computer or music server for that. Roon core features integration of Tidal and Qobuz, DSP and upsampling, multi-source library management, network streaming, and the ability to imbed HQPlayer–all with a nice UI.
In your setup, Roon will not add anything.