Re:Any phone but iPhone X, according to this Sprint salesman
by dragonwriter on Monday December 18, 2017 @05:45PM
(#15956184)
False negative is important to usability, false positive is important to security; both are important.
In other words, "recognizing me 99% of the time" isn't nearly as important as "recognizing when it's not me 100% of the time"... and there are already known spoofs out in the wild where it won't successfully recognized unauthorized access attempts.