Fringe scenario? Ok, cool, so what's my workaround? I can tell you right now this isn't a big issue with TouchID as it currently operates.
It's a legitimate situation I run into more than a few times. If you want to handwave it away then why bother replying. Zeypher asked for a scenario and I gave them one.
I'm not specifically saying your one is fringe or not, it wasn't my intention. What I meant was that there are dozens, hundreds, thousands, whatever scenarios that any one can come up with, some legitimate some not so. but just kind of listing them all is kind of asinine, because for each and every one you could probably come up with some equally asinine workaround.
It's just a pointless and meaningless exercise when people personally find their own solution, yes, sometime it's stupid and clumsy, but life goes on. You either find a way, or you stop doing it, you don't use the feature,or if the issue is so insurmountable, you just don't get that phone any more.
It's like the headphone jack. Doesn't matter whatever scenario you want ("i want to listen to MY headphones, while I charge!"), how legitimate it was for you, or however many other people. The fact of the matter was the jack was removed, and you either use one of the workarounds, or you don't. If it turns out to be a huge problem for a majority of people, then, it will reflect in sales, and Apple may turn around.
So you can no longer unlock your phone using your thumb to give to a co-pilot. It's a valid situation, I've done it myself often. But is it really that big a deal? if it is then you just either unlock your phone first, or turn off the features if you think you'll require the need.