The analogy is one of defense in depth: if you're serious about security, you can use memorized & typed secondary passwords on secure apps, such as secure notes

The analogy is one of defense in depth: if you're serious about security, you can use memorized & typed secondary passwords on secure apps, such as secure notes in 1Password, or an app like https://guardianproject.info/apps/pixelknot/ https://guardianproject.info/apps/pixelknot/ that would steganographically encode secure notes into otherwise normal photos, potentially with independent passwords for complete deniability. A locked door and a face-locked iPhone are only the first line of defense, and are largely for convenience's sake in both daily use/as a deterrent and in the case of physically being distant from your property. The "guns" are entirely independent.