Most education reformers want to evaluate teachers based on the improvement/lack of improvement in their classes. This tends to mitigate the problem of good tea

Most education reformers want to evaluate teachers based on the improvement/lack of improvement in their classes. This tends to mitigate the problem of good teachers in weak schools being punished. I think this is in place some places, though I can't whether there are places that do this the absurd way you're afraid of.