https://www.rtings.com/headphones/tests/sound-quality/passive-soundstage
Are you invalidating all of these measurements?
Saying that technicalities cannot be measured?
You guys sure do measure an apple dongle and say is all you really need.
But when it comes to technicalities everyone agrees that they are subjective?
It depends on so many factors that are outside a designers control. Shape of the listeners ear, age of the listeners ear, musical taste and EQ preference. I mean you can dial in a lot of but just those 4 things can dramatically change what headphones listener prefers.