Earlier quoted context omitted.
> It's arguably more secure than a 4 number passcode My friends often have to share their passcodes with me; at which point it's like, what's this adding?
I don't have a passcode on my phone to protect it from my friends ... similarly I don't have a lock on my front door (that I give spare keys to friends for) to protect me from my friends.
I guess that I think once you share it a few times and it's used regularly, then it becomes fairly public knowledge. Maybe this is a mis step from password security.