Here's a hot-take, music education version:
Music theory and music education focuses WAY too much on harmony, which is comparatively one of the least important aspects of most kinds of music. Especially in comparison to say, melody and form which are two of the most important aspects of music regardless of genre. The only lipservice melody gets in conventional theory texts is a brief description of what a period and sentence are, and maybe a mention of motifs. You cover it for like a week in Music Theory II, and then never again for the next two semesters. I've been focusing my private studies more on melody for the past few months and I've honestly learned so much from it. Like that melodies almost always start on a note of the tonic triad? Or that the "move towards a cadence" part of a sentence is based on liquidating the previous parts of the melody down to a basic motif and sequencing that? Or that the grand, Romantic, lyrical melodies don't follow either of those structure types and have their own structure? That's all GREAT information for a composer, theorist, or performer to have and none of it gets mentioned even once during the basic studies.
And with form, you only get a brief descriptor of what the parts of a Sonata are and that there's Binary, Rondo, and Ternary forms. How are the individual sections created and how are they expanded from a simple 8-bar phrase into a full section? How are effective transitions made? Exactly HOW do the themes in the exposition get developed? Who knows! None of that gets covered in a basic theory course, even though it's going to give everyone a greater understanding of how the overall piece is structure. Also great information for everyone that we miss out on.
You know what we do get instead? 2 weeks devoted to common tone diminished seventh chords (which appear very rarely) and almost an entire semester devoted to frickin' Serialism (which isn't really that popular outside of academia and is pretty much dead even there). Maybe 4 out of the 64 weeks are devoted to conventional structure and melody, everything else is counterpoint (which is admittedly fairly useful) and harmony (mildly useful, but it's overemphasized).