I firmly believe our current state of knowledge cannot fully describe the sound quality that will result from a given system/room.
You're not alone.
I don't think anyone has made such a claim.
As stated earlier, even Amir doesn't believe that measurements alone cannot predict better than 70% of how a loudspeaker will sound.
Perhaps we'd be better off trying to establish just what this remaining remaining unknown 30% might be?
Perhaps tone and texture fall into this category, as I'm not sure how they can be currently measured at present.
Given that the audio subjectivists are so skeptical of science, why do they so readily believe wild and unsubstantiated claims concocted by manufacturers of all sorts of cables, power conditioners, power supplies, etc.?
Wishful thinking?
Overoptimism?
Double standards?
Or just plain desperation after years of chasing after that elusive 'perfect' sound?
Perhaps for audiophiles, enticing promises from manufacturers and designers are always easier to accommodate than challenging rebukes and warnings from well meaning third parties?
At just what point the individual loses control over his purchasing intentions and gives in to compulsion is no doubt a question of great interest to marketers worldwide.