I’m convinced that as I age (61), my ability to decided between what should sound better interferes with what sounds better to my hears. I’ve EQ my setup with a MiniDSP. The frequency response is shown in Green and roughly +/- 3 dB. The response without EQ is shown in RED. The miniDSP is obviously doing its job in flatting out the response. However, the EQed response sounds dull and lifeless and I much prefer the sound of response through the MiniDSP without any filtering applied. Has anyone had the same experience with EQing to a flat response.
Just go with what you like and sounds best to you, that’s really the only rule for a hobby like this. It’s very likely you’re hearing has changed with age and that’s fine too. Look at the graphs here.
https://www.thelancet.com/journals/lanwpc/article/PIIS2666-6065(21)00040-7/fulltext
But even if you were 18 and liked that non-eq curve that’s perfectly acceptable. Don’t listen to what someone else or some dogma says you have to do. We like what we like!