Keep in mind this.
1. The teachers of the 1900-1960 period were mostly people who’d done one single year at some teacher’s junior-level college, gotten a certificate, actively read the classics, and structured the classes to fit their way of teaching. In the late 1960s as I attended, they still had a couple of teachers without any bachelor degrees.
2. If a person had a deep background in physics, and wanted to take five years off from their professional side to be a regular science teacher...most states would make it a hard and difficult experience getting the stupid certificate. Unless you attend their special teacher classes....you won’t move up into the ‘special group’.
3. The twelve-group system is now regarded mostly as a professional kid-sitting service, where most kids could pass a test in the tenth grade and just graduate at that point....moving on. We waste time, resources, and funding....keeping the current system going, and providing major leagues sports some potential help in training future athletes.
It should be that if you've demonstrated competence teaching community college science/math, then you should be considered qualified to teach high school science/math. The problem is, it would devalue the "credentials" of the existing teachers and administrators, and they are the ones who affect hiring and retention.