We have an incredibly small sample size of sets of twins with which this has been tested and at worst...the results are mixed. You act as if there has been conclusive proof. Not even remotely close.
Apple admitted that it would be an issue in there keynote. I would call that conclusive proof but please prove me wrong. And yes I admitted that it was a small percentage of the population that would be effected but again..... The point remains that this is an issue when it was not with TouchID.