Imagine a world where all audio equipment was designed by listening alone.
A world with no reference points.
No frequency response data.
No dispersion plots.
No resonance waterfalls.
No calibrated crossovers.
Now imagine a world where it wasn't.
What's the difference?
Only about 150 years of scientific progress.
I daresay even a hundred years from now there'll still be some people who will claim to prefer the former.
But none of them will be designing audio equipment.
Or look at it another way, if you go back 200 years, you won't find anyone having this debate.
In fact you won't find any audio playback equipment at all.
Perhaps what subjectivists really seem to searching for might just be a graphic equaliser module to tailor the sound to their own particular preference?
The only thing they will ever convince objectivists such as scientists, engineers, designers, manufacturers etc is that they see the world differently.
We already know that.