Simple explanation is that most commercial recordings are mastered to sound great on lesser systems. High rez systems will make all those recordings sound like crap. Unmastered albums is actually a thing now.
What in the world is going on.....
My system cost about 75000 dollars or so. I got the rave review LP of the new Paul Simon album.....sounded pretty lousy. I listened to the included M3P download using AirPlay through my Denon receiver and Senheisser wireless earphones, and it sounded wonderful...... What in the world is that all about....