Sound quality of Roon just fine, with so many variables and unique streaming setups extremely likely many opinions on it's quality will be offered.
Per @mikelavigne . Do you think what may be best streaming equipment existent would use Roon if it offered diminished sound quality!
Roon sounds best with separate endpoint, all processes turned off, therefore, dsp, volume leveling, analysis, etc.
Also, Roon likely has deepest pockets of all music players, not likely to stand still on either interface or sound quality.