I expect the simple reason is because it’s in the college’s best interest to use vague wording. If the college instead gives an explicit threshold, such as may rescind with Ds/Fs grades or <2.5 GPA, then that encourages admitted students to slack off so long as they maintain a 2.5+ GPA . It also limits the college’s ability to vary threshold for rescinding, with the widely varied grading systems at different HSs; as well as limits the college’s ability to vary threshold for rescinding among different individual students. It may also open the door up to successful lawsuits, if a college wants to deviate from the explicitly worded thresholds for particular unique situations.
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