It is possible that some people don't have the ability to do math well in the same way that I don't have the ability, try as I may, to draw well. Should society have a place both kinds of people? Those who can't draw and those who can't do math?

Drawing is not as essential, though, nor are musical talents or athletic abilities. The prerequisites for teaching should not include those, unless the person is to teach one of those fields. Language and STEM are foundational to learning and achieving in most every discipline.

I don’t think I could make a living selling sketches in the park, but the ability to “draw a picture” is actually a basic problem solving step in a lot of these math problems.

The question is, should they be teachers given their inabilities? Should the blind be tour guides? Both are possible, but better solutions exist.

That is the point of schools! To teach people skills they don't have.

Whether they're successful doing it is different discussion.