Passwords can always be used. You can forget a password, but you can't drop it down a storm drain, or have it all of the sudden fail to boot, or forget to brin

Passwords can always be used. You can forget a password, but you can't drop it down a storm drain, or have it all of the sudden fail to boot, or forget to bring it when you're at a friends house and now you can't answer your user's calls to fix the site that went down for some reason.