I got an email this afternoon from a student who registered for my class after Friday's class. So zie has missed a week of class.
I know it's not the student's fault, but what a pain in the rear. This class has already turned in an assignment. Should I let this student make it up? How about the assignment for Monday; allow hir to make it up, or no?
The student sent a polite email, which is good. But it's still a pain in the rear to rearrange stuff for a new person. We're sort of the factory floor of education; it sucks but there it is. You do all this planning to try to make things work for 20 or more students, and then you have to rearrange.