No it's a bit more than a really nice interface... it does give you pretty much full control over your sound settings (incl. upsampling, filters, etc.). Even without any DSP active, Roon does sound better than for example Mconnect with my PS Audio DirectStream Sr (with bridge II).
Also, you don't need to have your Roon core computer connected to the end-point, but it needs to be on the same network. I have my Mac in my office and my DirectStream in the basement. No direct connection at all... the Mac is connected to my network wirelessly and the DSS is wired directly to the router.
Also, you don't need to have your Roon core computer connected to the end-point, but it needs to be on the same network. I have my Mac in my office and my DirectStream in the basement. No direct connection at all... the Mac is connected to my network wirelessly and the DSS is wired directly to the router.