I don't really get the point you're arguing for.

I disputed a specific mistaken proposition, that "holding up industry secrets is deemed more important than fostering a community of personal growth". It's a mistake on several levels: there's no dichotomy as it's presented in this sentence, and the reasons for not providing multi-tracks and project files are different.

> If musicians' priorities were for the world to share in their musical indulgence not just in listening but also in like-minded creation

So? They have other priorities so this is not what they do. Teaching is an industry that's only an adjacent and derivative activity to the cultural sphere of arts. It's of no concern for the artist, unless they choose to capitalize on their skills/knowledge/experience.