[developer2]

You always have the password as backup to unlock. If your appearance were to suddenly change remarkably, such as via plastic surgery or a horrific accident, you would set your new face after unlocking with the password.

Based on their phrasing, I'm assuming the "adaptive" aspect means that slow changes, such as gaining or losing weight, will progressively train the existing face - without it ever failing to recognize you because you passed some weight threshold. Same would go for growing a mustache or beard. As to whether you can shave off a 5-year beard and have it still recognize you without manual intervention, that would depend on how much the algorithm cares about your chin and lip regions vs. the rest of your face. Based on the demo, the hair on top of your head is 100% ignored.