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Because people are lazy to remember passwords and or setting pin numbers on their phones.

FaceID and TouchID are compromises for an actual password or pin. Also, setting these things up force you to set a 8 digit pin.

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Definitely this. When I was using an iPhone, it was for all intents and purposes locked behind my thumbprint (even though you could theoretically make a model thumb with my fingerprint and unlock it, it protects from everything other than highly skilled criminals/governments who very specifically target me). Now that I have a Galaxy S5, there's no way I'm writing in a passcode every time I unlock it (and that horrible "fingerprint scanner" is not a replacement for Touch ID), so it's just unlocked.

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