Moshe:
Teaching is a job that cannot be measured by classroom time. There is preparation, there are other aspects of management that occur outside of class time, and there is an overall responsibility that places the teacher/rebbe on call 24/7. I agree that we have observed many entering chinuch as a default, having zero training or skills for the job. And you are correct, that we should have merit pay, with only secondary value to tenure. It is tragic that people go into chinuch because it is their version of being klai kodesh, basically an irrational fear of all other forms of work. That’s hiding behind religion which is antithetical to genuine spirituality and connection to Hashem. It also denigrates all others who make their parnosoh doing lots of other things, most often jobs for which they are appropriate. That is not attributable to a derech of Torah.