Your iOS device passcode also gives root access to your entire iCloud account, including the ability to reset your account password. This was highlighted a couple months ago by the Wall Street Journal in relation to a recent wave of thefts & account takeovers which were exploiting this: https://www.wsj.com/articles/apple-iphone-security-theft-pas...

It seems we all need to treat our iOS device passcodes with as much importance & sensitivity as the password to our password manager—essentially root on your digital life.