Inputing passcodes seems somehow worse. Not only can someone easily sneak peek or record it, they can also analyze the dirt on the screen to figure out the areas that are more pressed.
Discussion
Yes, and having to input a passcode every time encourages the use of weak ones instead of a good alphanumeric one
Thats why Graphe OS allows you to scramble the PIN input panel.
fingerprint is worst password - can it case easily copied by anyone some knowhow of Forensic science
iris scan even worser - user can held at gunpoint to eyes open
any biometric authentication is hazard to person's physical health - dead man owns no fking bitcoin