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Err they do. You can just brew install smartmontools and use it. Even disk utility reports the device status.

There was a post on HN recently talking about how SMART isn’t available over USB without a third part kernel extension: https://news.ycombinator.com/item?id=30976160

FWIW it's not a big deal for semi-technical folks to install, and some tools (like macOS SMART monitor DriveDx) include it: https://binaryfruit.com/drivedx/usb-drive-support

Doesn't work on my external hard disks which are connected over USB 3.0. Both diskutil and smartctl report that SMART is not supported. Under Linux, these work just fine.

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