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 is the author of dozens of books. His most recent include Take Control of Your M-Series Mac, Take Control of Securing Your Mac, Take Control of Zoom, and Six Centuries of Type and Printing. In his spare time, he makes Tiny Type Museums. He’s a senior contributor to Macworld, where he writes Mac 911.