My Wharfedale speakers much more punchier when connected to Onkyo amp than to Yamaha AVR. Sold my AVR replaced with Yamaha soundbar and now more space in TV area and better integration to the TV and reduce the electricity cost.
Those products are built for different purpose. From the begining, power supply, main board, capacitors, etc are all different design. So why doesn’t Cambridge Audio produce AVR if all audio are the same? It only attach the HDMI passthrough in its amp.
I would say that it's best not to take things too seriously here.