As one who did quit, I came to believe that no matter what I did (and my gifts and productivity were considerable), I could be fired over not achieving a 3.6 or higher. I taught "killer" courses, which students despised because they were so weakly skilled. I inflated grades to survive, but many students just failed out for not handing in any work. Even with 40 in a class, I gave personalized feedback, including an oral wrap-up commentary as well as a detailed rubric. I published. I attended conferences. I volunteered for everything. Yet, I felt in my IPPs that they searched hard and long for cracks--particularly in end-course evaluations where weak-minded punched back. I had been injured in my last session, but that mattered not. I was expected to perform injured or not. So, I quit. I have hard feelings about it. But, I am much better off without the inescapable unfair, unjust, inhumane practices…
Went through the same thing, so I can really relate to what @Xfr3RZC-1gsu is saying. Great post!