The "real World" is that a public school district is a governmental agency, and they exist because the public wants them. As a former teacher, I do not see, for the life of me, how you can tie salary to the performance of students. Exceptions would be the scores that students get in AP courses, over a period of years, but that --to me fair--would depend on the teacher's ability to select students. I mean, to have the same choices as a football coach.
Wow, I don't see how it should be any other way. It seems like the more reasonable and applicable barometer. We really are of different minds on this. So far apart, I think, that we can never come to agreement.