@Gavin S Not trying to be a smarta** but it was opened up in iOS 8, with the LocalAuthentication framework, no? FaceID is in there too, for Xcode users (and other IDEs). What am I missing?
No, no, no... Please try to be a smrtaRse ;)
Sometimes I have a habit of misfiring my brain dumps, and I can see that not all cylinders were igniting (it can't be the head gasket can it?).
You go to your banking website on your Mac, enter in your appleID (lets just pretend that Apple isn't Google and they're not interested in knowing what bank you use). Bing, a dialog appears on your iPhone and with TouchID, you authenticate that way. Same goes for Amazon, HBO and your favorite web site of raunchy pictures (and movies in 360˙).
You go to your project management application to work on your global domination scheme, same process, your phone combined with your fingerprint becomes your password.
Now if you have an emojiBook Pro, you can verify right there and then, see that $500 additional bucks for an emoji input device was worth it right?
Apple have all the pieces in place to do it (ApplePay), or do they? It seems like TouchID is being replaced with what was labelled as more secure, but your neighbors kid can now get into your phone ;)