One of the most valid reasons I’ve seen recently in response to due dates! This is much more relevant to students than the also true reason many teachers give which is “You’ll have deadlines in college or the work place.” Students need to see how it impacts their life NOW!
The problem with accepting late work without penalty is that due dates exist for CONTENT reasons, not just CONVENIENCE.
If you didn't do the work yesterday, you won't be ready for today's lesson, and you'll learn less.
If you didn't turn in your draft, you can't revise. Etc.