But the same thing happens with people in other industries. I was held to how well I completed my major projects - even though it involved a team of people, even including people outside the company - to complete them.
The problem I see with how you view how “unfair” teachers have it is that you don’t appreciate that others face the same thing, or other obstacles.
The big problem that teachers face is the lowering caliber of education by “dumbing” things down - along with, of course, all the wokeness stuff. The leftists are more concerned with the feelings of the low performers than they are with encouraging the best and brightest to reach their potential. “Equity” is the problem.
The same with organizations in every blue city. They are more concerned with getting “diverse” management than the most capable management. Again, “equity.”
Most problem can be traced to liberal ideology.