Can a smartphone's PIN or password be brute-forced in an offline attack?

security.stackexchange.com/questions/202174/can-a-smartphones-pin-or-password-be-brute-forced-in-an-offline-attack

Ciro Santilli has a hard time understanding why this is possible, e.g. many people use short 4 digit pins, or a short swipe pattern. Why can't this be cracked easily offline?

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