It’s easy to fool ourselves into believing the world is normal, sensible, and without rare-but-undeniably-valid edge and corner cases. Maybe you’ve done this to yourself with email. I’m guilty.
One example, we do email-based authentication (no passwords!) because I believe(d) this particular falsehood:
Emails will be received soon after they’re sent
I wish it were always true! Thankfully, there’s a lot of things on the linked list that I don’t believe. Do you?