Yeah it's averaged over two sections, so that helps too. If it's just one, the swings can be greater of course. Some students have more important classes or things in their life. Why be so egotistical as to penalize it.

I do make it clear that the final grade deadline matters bc I can't miss my deadline to the uni. So it's not like work can be delayed indefinitely. Plus a lot of them want to get on to the next assignment, etc.