The better your system is, especially imaging, the more it will reveal the great, good, bad, ugly.
The more you experience excellent imaging, the more you are aware of problems.
One category is excellent but needing a slight balance tweak. I use my Chase RLC-1 for the advantage of remote balance from my listening position, in very small steps. It is amazing how much is gained from a small correction.
Another category is weirdly produced imaging, a drummer on the right moving to the center for a solo, same thing with other musicians moving about.
Get thee equipment with a mode switch for Mono.
Next we have playing Mono LP’s. Not only a true mono cartridge ignoring any vertical anything, but again, a mode switch with Mono, or sometimes better: both channels sent to only 1 speaker. That avoids your brain from it’s habit of seeking imaging when in your listening spot. You can move here and there with Mono from one speaker.
Not great music, not great engineering, oddities, BUT great songs, great memories. I keep a MM replaceable stylus cartridge just to play them with, to enjoy as I always did, but not gonna wear out my expensive MC non-replaceable stylus for them.
I often say "I can't hear any difference", but I certainly can hear differences when they are there to hear.