the big issue aside from ignorance, is that there is no neutral for headphones the way we define one for speakers, or to calibrate your monitor. the cause being that headphones don't provide sound in a natural way. with speakers, the sound comes kind of like it would from an actual instrument, it interacts with the room, bounces on our body/head and reaches our ears in similar fashion to any other sound source in the room.
for a screen calibration it's the same. we look at the screen like we would look at anything else. there is no need for magic trick to fool us, just send the same tone and we'll see the same tone.
now for headphones, we bypass the room and the reflections on the body and head. the ears are included but with a sound source at 90° or close to that on angled headphones. so the cues we get from the sound bouncing on the ear are for that angle, not for the singer in front of us. so even if we disregard interaural cues, head movements and all those fun HRTF related stuff, and focus only on basic FR, neutral for a listener requires an extra compensation tailored to that listener's body. good will is hardly enough to achieve that for the random guy. I think products like Sonarworks are certainly a step in the right direction, because no matter how different we are, we still tend to have a head on our shoulder and heads smaller than Mars Attack aliens'. so while not exact, chance several aspects of the calibration go in the right direction for most people. but it will be real neutral only to people who fit the model they picked. for the rest, some more or less significant EQ is still necessary. hence attempts to find our own neutral like proposed in this topic.
I don't disagree with your message, a better balanced frequency response should be the first priority to audiophiles instead of gimmicks and expensive toys to get HI-FI silence at -100dB. my point is only that I understand why most would just give up. they get overwhelmed by all there is to know and all the personal work to put into setting up an EQ properly.