MQA ..very much like both the A2D and the DAC ( in many cases plural ) used to create / mix / deliver the modern music we all enjoy… ( or not ) ALL have issues… attempting to fix those issues - often directly liked to the various filters ESSENTIAL to ALL digital IS / WAS a noble pursuit…
Did you ask the very accomplished people at Berkeley ?
I own a DAC still in production some ten years in… @erik_squires .. i view this as good compared to the seemingly endless parade of dac de jour round here….