Comment by GuiA

> Grade school teachers aren't expected to be specialists in the field they teach. They're expected to be specialists in teaching.

Yeah, and this breaks down pretty fast, particularly when it comes to teaching the stuff you can't easily hand wave, e.g. science. Even at the middle/high school level, where teachers are supposed to have studied topic they teach at the undergraduate level in some capacity, you find plenty of foreign language teachers who are terrible speakers of the language they teach, or math teachers who basically have the same level of math as their students, with the distinction that they have access to the answers for the exercises they give. I spent some time in a US state university for grad school, and the level of some students who majored in education and later went on to teach was abysmal. It's hard to tell if the hegemony of standardized testing is the root or a symptom of the problem, but the overall picture is bleak.

This is precisely why if we want a great education system, we need to incentivize people who are practicing professionals first to then go teach. My best teachers in high school all shared those traits: a historian who had spent many years doing field research teaching history/geography, a geologist who was also a researcher for a major lab teaching natural sciences, etc.

Not everyone is made for teaching, but we as a society need to become much better at encouraging and enabling the people who enjoy it to teach in parallel to their professional activity (I would happily teach math from 8-10am before my day job 2-3 days a week if there was the structure for it.).

The people who want to become teachers just because they like kids but don't have any deep knowledge/understanding of any particular subject can teach kindergarten.