Hi Seth:
Good summary. When a teacher can determine their curriculum is about the right fit fora class, pretesting probably isn't needed. It's those times when there is some uncertainty that having students pretest will prove beneficial, for the reasons you cited.
Another benefit is comparison of first day to last day performance analysis. This can helpful to assist preparing for future classes and also to a degree, provide some degree ofmeasure how the teacher's performance was for that specfific class.
Regards, Barry