Nice presentation.Crossfeed is just a tiny part. DSP can do much more than that. See below link for some ideas of what Dr. David Griesinger did with his Logic 7 upmixer, and the issues he was trying to address. And that was 15-30 years old. The "technology" used in this Schiit product is about as primitive as it gets.
But there always needs to be room left for improvement. Now I can see the "Syn 2" being released in a couple of years, right?