This is a bit orthogonal to your original point, but I feel pretty strongly about it.
Roon gives you the opportunity to correct problems in your listening room via DSP (digital signal processing). @Magnus has done a wonderful guide on how to go about this and his thread is here A guide how to do room correction and use it in Roon
Room correction is a great way to improve sound quality. Solid physics, no bells and whistles. So it is an improvement with Roon and your Nucleus but in a different way.
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