Mechanchim have the same problem as sports coaches do.
When the kids do well, it’s because of the family life or the parents or maybe even the child him/her self
When the kids show the slightest disinterest regarding anything having to do with “the yeshiva world” all of the sudden the teachers get blamed that they arent “selling yiddishkeit” the right way or are intentionally harming the child.
There is an old saying that “Players win games and coaches lose them.” So while I sympithize with Mechanchim and realize that they are in an untennable situation. They should go into teaching knowing that you are under a microscope and are the manifestation of what the parents of a child are spending their retirement savings on. If you can properly understand that responsibilty and still want to work under those conditions then good for you.
If you are going into teaching because you dont want to get a job outside of the “system” then all you are doing is stealing from that parent/child.
Maybe if there was a school where the teachers/administration all felt and acted that way, I would feel better about going into debt for Jewish Education. But right now, I’ll take my chances