[forgottenpass]

You're assuming this was a "didn't know" failure mode, not a "didn't care" failure mode.

I'd wager it was a "didn't care". They knew about the limitations, figured the product would work often enough to make some money and labeled everyone pointing out the problem as haters or technophobes.

Someone probably even pitched a keypad password based redundancy and got drown out in valley buzzwords about MVPs and shipping fast until they gave up.