How FileVault and the T2 Security Chip work together in newer Macs

Macs with a T2 chip always encrypt their drives. Why is FileVault necessary?

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Glenn Fleishman’s most recent books include Take Control of Zoom, Second Edition, 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.