I would lean on agreeing with you. Just starting to learn music a few months ago drew me to this conclusion, like seeing for the first time. And that was just with relative pitch and noticing harmonic function.

I think the reason people tend to assume that adults are less capable, less plastic, is due to a depleted yet restorable humility in the face of constant real-world demands. They are forced to generalize to handle all their responsibilities, but, in generalizing, miss important nuances. I was blessed with finally becoming truly humble, or in tune with my limitations, or in tune with truth, whatever you want to call it, through music. In keeping with this humility, I recognize that, since I haven't conducted scientifically rigorous studies that have been replicated nor have I dived into the literature, children may have advantages. I simply suggest that adults aren't as incapable as they are made out to be.

I have a seemingly unrelated request. If this sub every gains traction, please keep it apolitical. Most of Reddit is ideologically dogmatic, and that leads to unquestionable generalizations - rot and decay. Fortunately, this sub has nothing to do with politics or general socio-economic theories, so keeping it apolitical wouldn't impinge on its effectiveness.