I agree with your first point, the author's claim that it is an instrumental vs. lyrics problem is not accurate. There are easy counter examples, such as the p

I agree with your first point, the author's claim that it is an instrumental vs. lyrics problem is not accurate. There are easy counter examples, such as the popularity of instrumental dance music, which often features very little in the way of lyrics and the vapid nature of most pop songs, as well as the ability of many listeners to appreciate music performed in a language other than their own. The problem with a lot of jazz, what I would call "bad" jazz, is that it is formless noodling. It is in areas like jazz solos, jam rock bands, rock guitar solos, etc. that one hears the admirer comment on the difficultly level of the performance versus the coherent melodies and hooks of popular music, and even many popular classical works. The popular jazz standards have melodic hooks that cause people to like and remember them. Beyond that surface, a vast majority of jazz musicians are more focused on the intricacies of group performance than composition. Sure more musical education, or better brains, would enable people to develop their memories to be able to recall and hum along with longer and more complex note sequences, but you still need to compose them- and repeat them. (Recall the Mark E Smith formula for pop music "Repetition. Repetition. Repetition.")