One thing to keep in mind is teaching is a psychologically demanding job. A good manager will provide the tools needed to succeed professionally and may provide you with the tools to deal with personal issues, but they ultimately have the option to cut an employee loose if they cannot make positive contributions to the workplace. Contrast that to teaching. The measure of success of a teacher is the success of the students who they teach. They often learn details of a student's life that few managers would ever learn of their employees. A well functioning adult would have difficulty dealing with these things, never mind a child or teenager. These are things like children who have had a parent who committed suicide, teenagers who are aging out of the foster care system, students with psychological conditions that would preclude them from most workplaces. These, and many more things, leave teachers working in an environment where a portion of the students are not ready to learn no matter how skilled the teacher is at motivating and delivering the curriculum.

Teachers have to do much more than that. While maintaining their own mental health, which is challenging given the environment they are frequently working in. (Even more so since most teachers enter the profession with optimism and compassion.)