[foofoo4u]

Same. For K-12, at least, I believe the reason why no one could give a solid reason is because the teachers who are teaching the subject have literally no professional industrial experience with math. They have nothing to share with no real-world insights. I presume this should come to no surprise. According to GTP, the average salary range of a mathematician in the US is, "$80,000 to $100,000, while more experienced mathematicians can earn up to $150,000 or more." With salaries like these, no one working professionally as a mathematician would choose to downgrade to become a teacher, with teacher pay, lower respect and deal with uninterested, rude, problematic students.