I do agree, music is inherently a psychological art to begin with. What is music to some, is noise to others and vice versa. Keeping a blind perspective does help. In most cases the listener’s perspective is dominated by the 4K spectrum that most ears are sensitive to. Any changes and variations in that range can cause predominant gaps in listening experiences.
yes absolutely correct. However 12k and 18k are quite far. When most casual listening drops flat at 12k, anyone who can hear past that will have a different listening experience, specially if the mix has been boosted with “air” that most mixers today tend to add in modern pop. My friend has a very hard time listening to anything artificially boosted.