Same for password managers: Are there any that allow you to split your data into two categories: Protected by fingerprint and protected by passphrase? I'd love to see that feature.
I.e., you cannot securely encrypt something with a function of your fingerprint: anyone can cycle through fingerprint representations and eventually get decrypt the data (or the key to the data). You can, however, authenticate yourself to someone (or something) which holds a plaintext encryption key, and once you have been given the key, decrypt the encrypted data. This only works if you can trust the person or thing to never give the key to an unauthenticated part. That only works with hardware, since any software which holds a key in plaintext can be examined to extract the key.
This would cover the case where you use your phone a lot and need to lock/unlock faster, while forcing a password entry when your phone gets stolen or used behind your back. You can still be forced to unlock it right after usage, but at this point you might have bigger problems.