Earlier quoted context omitted.
Am I wrong that an (inevitable) biometric data breach would mean this can be done on the cheap (if you were unlucky enough to have given your data to a third party)?
Yes, at least for finger prints. Getting the print is easy, especially with glass back phones, it's making a good enough fake that's non-trivial.
https://www.theregister.co.uk/2002/05/16/gummi_bears_defeat_...