I know the argument remains unresolved - are these things in my mind, or is it that science has not yet figured out how to measure certain things that we perceive in audio?
We can't measure what you perceive. You listen to a track that brings you joy. We can't measure joy. What we can measure is the sound coming out of your audio gear. That is the sound that is "heard." What is perceived includes many other variables that go beyond sound. I enjoy watching my Reel to Reel play music. It brings me joy. But that has nothing to do with the sound. The sound is excellent but I hear background noise which is not so nice -- something we absolutely measure.
Put more strongly, you have to identify what is sound and only sound in your perception. You can't look at something, and give an opinion because your knowledge of what you are seeing pollutes your perception. A person not likely horns will dislike any horn speaker. Put them in a blind test though, and they won't bring such preconception to the party. To wit, I was shocked how good these JBL horn speakers sounded in double blind tests at Harman that I took:
So bottom line, bring us an experiment where only the sound is evaluated and shown to not be random outcome and I will show you a measurement for it. The moment you include other things, we can't measure it due to no fault of science, measurements or engineering.
And oh, there is no science being developed to determine what you state. The science is completely settled that only results of controlled audio tests matter. where only your ear is involved. All else is not worth even looking at.