Galliardist
Major Contributor
This part of your post misunderstands the relationship between musicians and instruments, and what musicians do. Musicians are effectively dealing with aspects of music and sound organisation that can be done sighted, and are trained to be able to deal with those aspects. One thing is that musicians know that they are also using their experience, training and knowledge to judge how sound is produced and manipulated on instruments, not just their ears. Choosing an instrument is about a relationship to that instrument: sometimes it has meaning outside of just performing, a large part is what that instrument will do when the musician uses and adapts their technique to manipulate its sound,Musicians as a cohort have no exposure to learning or training about things like the sighted listening effect. They spend their entire lives and professions thinking they are judging sound waves with their ears, sighted.
Even if they did know about it, they don’t run around doing blind listening tests of instruments to decide on which one to play, so either they don’t know about it or they are resistant to the learning.
Choosing an instrument is about more than just the sound of that instrument as you mean it. In Western tradition classical music, we have sometimes to subsume personal choice to the form of the music, both how it was meant at the time it was written, and the tradition that has grown up around it which leads to the performance practices we have today. The choice of an instrument will reflect that: and that is the learning that is important. Violinists may prefer modern instruments in blind tests, but the tradition of violin playing is more important than just the basic tone of the instrument used: the opportunity to play a famous old instrument sits better in their tradition. Different traditions and genre rules will provide different pressures on musicians, but similar concerns will exist.
It is fairly clear from the literature that being a musician does not really help in judging the performance of loudspeakers by listening to them: I have no problem with the rest of your post.