You are missing the key point: these experts on maths, sciences, etc are not arguing HOW to teach maths, sciences, etc. They are only arguing WHAT is important

You are missing the key point: these experts on maths, sciences, etc are not arguing HOW to teach maths, sciences, etc. They are only arguing WHAT is important to teach. High school math teachers do not have the perspective to understand what kind of math is needed for jobs in engineering, data science, etc (The fact is that a background in algebra and calculus is necessary for almost all of these jobs).