Yes lots is subjective when it comes to sound. I heard a difference with the 4 pole plug and I've been at this and music for a long time. We can only report what we hear and experience.
That's why I said at the beginning of this 4 pole jack discussion- if you've got balanced cables you can get a cheap 4.4 or 2.5 to 3.5 trrs - 4 pole adapter very cheap. Me and psikey listed 2 models from Amazon. I suggested if someone was curios then order it and try it. If it doesn't seem to change anything then send it back.
In other words try it for yourself
I'm not asking anyone to believe anything, I trust my ears I know it's not imaginary so thats all that matters. It's really not a big deal, easy to try if you're curious if not......
And firmware can change sound, it just happened with the latest update- who would have thought
and tiax- bs isn't exclusive, it's everywhere