The problem with this metaphor is that math is not only a form of art. Only for a very small fraction of population, math is art. For the rest, some basic maths are necessary skills for surviving in this society, like the skill to following rules/ play under rules. While music is much less on this necessity side.
I did. And part of my comments are even from the later part of his article on the criticizing of high school geometry. he talked from the real subjects of geometry side, and looked down the formal language presentation in the textbooks. But the latter is an important skill training, which is arguably more important than the mere geometry pattern recognizing itself for most of people.
The author was only targeting at talent people.