You repeat without any qualification that the Redbook layer is
very likely to sound better on a decent CD player or transport and DAC than the SACD layer will on a universal player that supports SACD
In my experience that is completely untrue. My evidence is that I could tell that my Reavon universal player had obvious problems with its TI Burr Brown DACs - it was down converting DSD to CD quality and it was so obvious I wrote to Reavon seeking clarification. My previous Marantz universal player sounded wonderful on SACD.
The fact that you haven't experienced this with your awesome player designed for "The best possible picture and sound technologies for an incredible home cinema experience" doesn't make it untrue.
I have experienced it, and what I'm sharing is actual listening experience, not hypothetical ramblings.
I have heard incredible sounding Redbook CD playback in my system and at least two others (one with Jay's Audio transport/DAC and one with a nice Ayre CD player). That's not to say that the same disc as an SACD wouldn't sound any better, only that many people are not aware of the potential of CDs to provide excellent sound quality.
I am primarily a vinyl guy myself, but it's been great to be able to pick up CDs for 3 or 4 bucks and have them sound fantastic. I also have a relatively small collection of SACDs and some of them are amazing.

