I'm not sure it was over-engineered. Recall when Touch ID was introduced there was huge media backlash: Apple is stealing our fingerprints, how do we know there isn't an NSA backdoor to the fingerprint storage, and so on.
The Secure Enclave system was set up exactly to counter those concerns.
Interestingly, when other phone vendors later implemented fingerprint unlocking there was far less outrage. Even when the fingerprint images themselves were found as unencrypted raster images on device storage.
The Secure Enclave system was set up exactly to counter those concerns.
Interestingly, when other phone vendors later implemented fingerprint unlocking there was far less outrage. Even when the fingerprint images themselves were found as unencrypted raster images on device storage.