When entering grades for an assignment category that will drop the lowest grades at the end of the semester, if a student has not completed the assignment because they know the lowest grades will be dropped, and a 0 is entered by the teacher, this drastically drops the students' total grade. This is a major annoyance for students, especially those in school programs that utilize grade checks to keep students in line. A student might have an A, but because the "lowest grade" doesn't appear to be dropped, the grade shows as a D, for example.
If the lowest 5 grades are to be dropped and there are 6 total assignments, if a professor enters "0" that grade should be considered "dropped" from the total, and not affect the total grade appearing so that grades can appear accurately. Or, if there is another way to fix this issue, whatever that fix is, make that change.