Reasons for SQ difference Roon vs. Mosaic?

Our own @Anupc has demonstrated that Roon is bit perfect. The fact that over on the Roon forums, and even here I believe, half of people think that non-Roon sounds better, half think that Roon sounds better, and everyone else is enjoying the music, is supportive of what @James suggests: this is all in the ear and brain of the listener. This is the sort of thing that is in fact quite amenable to double-blind A/B/X testing. But somehow I just don’t think anyone really wants an answer, more like an eternal disputatious quest.

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