Finger1 = identity
Finger2 = authentication
Both readily found on the case. Oops. Now try and change them - you only have 10 different passwords to go through (and my many years in biometrics show that it depends on where the reader is if you should even incorporate the thumbs - most of the time you're looking at index and middle fingers).
A password you can memorise and change at will. With a fingerprint reader you'll need to carry a cleaning cloth with you or it's like walking around with a rubber stamp and putting your password on everything you touch. That's also why in certain circumstances fingerprints are not a valid argument to set weaker passwords.