Trouble is upgrading to 818v3 would not provide those benefits, as I understand it, because the DACs are in the non-MQA DSP speakers and thus would be unknown to the 818v3. Also they could not receive fully unfolded (24/192 and up).
That is not to say that an 818v3 upgrade would not provide sonic benefits generally across all source formats.
And this is not a complaint about MQA implementation, it is just trying to understand what is achieved by changing different parts of the physical and digital architecture to achieve various outcomes between no MQA capability and full MQA capability.
Yes, you are right. But at least the 818 has full MQA rendering for analogue output.