Why do teachers/professors neglect IQ scores when considering who passes their classes?

Professors are giving out studies and information on how to think more critically and analytically. They believe that critical thinking and logical analysis are learned-skills. However, it’s quite obvious that they are more so genetic/environmental skills. They refuse to say anything about IQ scoring because it isn’t motivating. It could upset other people if you just told them that their understanding of the class is primarily based off of their IQ, but maybe I’m missing something.
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