Re: What's the big deal?
Oh my gosh. Press a finger and open up the device, that's appearance and not function?
The point is balancing convenience with security. The most secure things are terribly inconvenient. The most convenient things are terribly insecure.
That said, every time I restart from a power down, I have to enter my passcode on my iPad. TouchID does not open the device in that situation.
So where are we then? Well, I'm sitting here thinking that while my iPad is not the most secure device known to personhood, it is easier to get going than with my pre-TouchID iPhone. And you're sitting there thinking that your brain could not be broken into, and I presume that includes the hypothetical well placed hammer blows to fingers, toes, and knee-caps. Let me hasten to add that I hope you never have to be part of a test of those hypotheses.
But, for the sake of argument, let's assume that someone cares about what's on my iPad, has gone to the trouble of stealing the device, done what they need to do to simulate the correct finger in the correct position or insist, at peril to my kneecaps, that I open up the phone. After I get my phone back, as you say, I cannot change my fingerprint. Oh dear. What do I do?
Oh yeah. Make it password only. which was always an option. Also, hope that the security dictum "Kneecap access, game over." does not occur again.