Roon themselves recommend keeping the Roon core away from the Hi-Fi and not connecting it directly to the DAC. I am not sure why they would recommend this unless they had done trials to determine it as the optimum method. I would therefore accept their recommendation as being correct.
Roon Nucleus as a Streamer
The Roon Nucleus and Nucleus+ have been recommended here as a music streamer hooked up directly to a DAC via USB or i2s. Others advise against this saying it should only be used as a music server with a dedicated music streamer in the loop. What are your thoughts?