If I were giving a security recommendation to famous people and congresspeople I would recommend using a password like this. You might think it’s incredibly insecure, but imagine this GIF contained that 6 digit number that the congressman uses for all of his accounts. Suddenly, a ton of other services and passwords are vulnerable to an attacker.

In reality a lot of iPhones now require authentication at the app level for apps that have sensitive data.

To each his own, but knowing how public you are and how many people would want your passcode, I think the best practice is to use something dumb like 6 of the same keys.