josephhinvest: Good analysis from John Gruber...
"seems very reasonable to me that iOS should check for a trusted Touch ID sensor. But, if the sensor can’t be trusted, clearly the whole phone should not be bricked — it should simply disable Touch ID and Apple Pay. And, obviously, it should inform the user why. Putting up an alert that just says “Error 53” is almost comically bad."
That seems sensible. But sure Apple spin doctors will come up with a reason.