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SCSI-connected (flatbed) scanners existed a lot in the 90s and early 2000. Usually, they did need a vendor or vendor-specific (TWAIN, sane...) device driver to work, and IIRC usually implemented the 03h (PROCESSOR) device type.

Why was the device type and command set from the SCSI specification meant for such devices not used in many popular devices, and did any mass market scanners implement it at all?

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    As far as I can tell there was no separate SGC command set document. There was a scanner command set defined in SCSI-2 but it was never made into own document for SCSI-3 like most of the other device types defined in SCSI-2. SPC-3 made device type 06h obsolete, so I suspect it was never used. – Ross Ridge Aug 4 '17 at 2:45

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