I think that is wrong. Having the finger print makes longer (or even just enable at all) pass codes practical. The passcode is also a part of the key used to en

I think that is wrong. Having the finger print makes longer (or even just enable at all) pass codes practical. The passcode is also a part of the key used to encrypt the on device data and is not stored on the device so by having a longer key brute forcing is made less practical. Note also that the passcode is needed occasionally and if the wrong print is used it can be triggered sooner. The attacker doesn't get many chances using the scanned fingerprint. I'm not saying it is impossible to break or that a long passcode on its own isn't more secure but for most people the TouchID is a better trade off.