So, only one input? The confirmation action is for repeating the same pin number so that it's a match & for the user to confirm their input. It's like reminding the user of their pin to assure it.
What if they unintentionally hit the wrong number then it's done. Then they have to chance trying the pin numbers that may be the input, which if fails after so many attempts, the device is locked out. Then the user is resigned to having to factory reset the phone.
