This is quite an important point, though I would hope that someone who decides to dedicate 10 years or so of their life to the task would read up on the topic.

This is quite an important point, though I would hope that someone who decides to dedicate 10 years or so of their life to the task would read up on the topic. (I mean that non-ironically, I suspect it is often lacking and doesn't happen.) On the flipside, I have had several real teachers about whom I frequently wondered why they had chosen teaching as a profession. It was like they lacked both the aptitude for it, and had an intense dislike of students. To be fair, most were not like this, and there were a few truly excellent ones. But to make the argument that they are all highly trained, excellent professions is a bit of a stretch.