I asked a couple questions, that you left unanswered. Did you directly compare the Odyssey Khartago Extreme, with the Schitt combo, or- are you making assumptions? To expand slightly, on the second: have you any personal contact or experience, with ANY of the above EEs(Bunge or Moffat, in particular), by which to judge their relative knowledge/capabilities? Yeah, you said, " And we know Mike Moffat is no fool in Electronic Engineering design, I’d back him over Klaus any day.", which implies you assume Klaus IS one. Further, regarding Class A operation; read the portion of this article, dealing with heatsinks and Rolf’s design goals.
https://www.stereophile.com/content/rolf-gemein-heart-matter Far as a chassis with, "blanked off" holes: Klaus has to keep his costs down somehow, to offer the values he does. Having one chassis, covering a couple variations in amp design, is one excellent method.