This is a great point. Hiding behind "mumbo-jumbo" is certainly a big problem with many art forms, and actively prevents a lot of people from entering or even enjoying it. Classical music is sadly especially plagued by this.
It's somewhat natural for humans to create exclusivity, especially for areas they have spent a lot of effort or resources on entering themselves. In the case of art and other humanities, I think this is detrimental.
I think the shortcomings of notation and representation (and the pedagogy) of music theory is more the case of managing complexity. It's an evolved system, not a designed one, so it meets its goals in some sort of a local minima, and it'd take a large effort to move out of that minima. But the issues are different from what the blog post author points at. Most of those "features" are there for a very good reason, as most commenters here seem to support.
It's somewhat natural for humans to create exclusivity, especially for areas they have spent a lot of effort or resources on entering themselves. In the case of art and other humanities, I think this is detrimental.
I think the shortcomings of notation and representation (and the pedagogy) of music theory is more the case of managing complexity. It's an evolved system, not a designed one, so it meets its goals in some sort of a local minima, and it'd take a large effort to move out of that minima. But the issues are different from what the blog post author points at. Most of those "features" are there for a very good reason, as most commenters here seem to support.