One of the most glaring deficiencies I can see in the CCC is the chef is by himself on the entire bottom floor of the CCC. What provision has Amtrak made in case he is knocked out after hitting a rough spot in the track at 79 mph? With just two people upstairs it might take a while before someone realizes orders aren't coming up like they should and walk down to investigate. If our chef happened to be cutting something up and fell on a knife he could have bled to death in the time it took to discover his plight.
This issue has nothing to do with a CCC, the same problem exists under SDS in a full dining car. I'm not suggesting that it's not an important consideration, it most certainly is, but it isn't something unique to the CCC.
By the way, I suspect that those survey numbers mentioned above come from Amtrak's ongoing survey program that anyone and everyone whose taken a ride on Amtrak recently can participate in.