Re: What's the big deal?
"Nobody can break into my brain for a password."
You've nailed it.
I think Apple have done Motorola a favour here, fingerprints are no more secure than "loose" passwords, and like you said, instead of being secure in your head, you leave your fingerprint security key on almost everything you touch over your entire life. Worse still, as you said, once your ever so important fingerprint has been once compromised (and easily at that), you can't change it. Ever.
Changing fingers doesn't count, you only get 10 chances verses millions on a big-boy password. Or, like another poster suggetsed, use the middle finger instead. It means more.
Facial recognition? Don't make me laugh, you may as well save everyone the time and just hand over your device to the crooks right now.
Biting the hand that feeds IT
