I don't know about the technical side but I do know you can hear a difference. Remember when we were young and had eq. Or at least I did. The big ADA 20 channel one. Inevitabley we would, or at least most I saw were a smiley face. Accentuating the highs and lows. I just listened to Led Zeppelin Lemon Song. I let HQ player do what it could between the base file and the MQA remaster. My DAC is not MQA. The remaster is more clear and has a lot more high frequency information. However, In finding the original more flat, I also found I heard the swing and rythem of John Bonhams drums more "in the groove". I rolled with the band more.
If the end of the graph is the addition of all that high frequency information, then I can see why many people gravitate to it. We think its added music. The clarity is another issue. It's nice and I don't see much reason to dislike it. But in the end, it's closing your eyes and getting into the groove that sets me free. Not analyzing the song. The original does it better, for me.