Is blocking device necessary on Wi-Fi with a password set?

A reader finds a hidden feature, a bug, and a quandary in using Timed Access Control with Apple's Wi-Fi gear.
internet traffic cop
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Glenn Fleishman’s most recent books include Take Control of iOS & iPadOS Privacy and Security, Second Edition (covering iOS 15/iPadOS 15), Take Control of Your M-Series Mac, and Take Control of Securing Your Mac. In his spare time, he makes Tiny Type Museums. He’s a senior contributor to Macworld, where he writes Mac 911.