At 2 volts, THD+N = 0.003%
At 4 volts, THD+N = 0.015%
You’re not going to hear any distortion or noise either way. But the “issue” is that it’s not considered by some people to be “state of the art”.
SNR in Pure Direct Mode = 101dB, which Gene says is excellent.
These measurements were done back in January 2020. I wonder if Yamaha has made any changes to the CX-A5200 since the day Gene brought this non-SOTA issue to their attention. But we won’t know for sure unless someone like ASR gets his hands on a new CX-A5200.