I am sorry to read that you consider our music has a “problem”. Never in my seventy-two years have I embraced this assumption. Indeed, prior to my membership of music forums, about seventeen years ago, I was blissfully unaware of the appalling degree of competitive angst in the minds of pianists and musicians generally. I find enough to worry about in everyday life without adding my music to the quagmire.
It seems to me that many of the musical issues you discuss come down to a matter of personal preference. In the end all art is completely free and each of us just produces the sounds he enjoys. Is there really any more to it than that ? To what degree are perpetuity and supposed universality actually dependent on musical sound itself ? As I approach old age I come increasingly to the the conclusion that most of these properties emanate from social, economic, even memetic forces. I cannot listen to very much Glass, and do not understand Evans, for precisely the same reasons you enjoy them. It doesn't matter, there is no right or wrong about it.
..If perpetuity has no dependence on the musical sound itself, what’s the point in getting a music education as a composer or trying to improve at all? Also that would make the job of the music theorist absolutely valueless. That belief would go against a “growth mindset” that psychologists say is vital. It’s pessimistic for someone looking to improve their music making.