Thanks for making this change. I figured out one important point involving this change. I'm posting here for anyone's benefit. Though it would be helpful if Salesforce would make this concept easier to understand. The PIN Length is obsolete and is completely ignored. However, Lock App After is largely ignored because it is nearly obsolete. The Lock App After setting has one remaining purpose. As long as any number is selected (instead of "None") for Lock App After, the device's biometrics (example: Face ID) or the device's Passcode will always be required to unlock the Salesforce mobile app. Therefore, any time the logged-in app is left (screen locked or went to a different app without quitting it) and then the user comes back to the app, biometrics/Passcode is required for unlocking.