Notably with the Steam Frame you're stuck with the high end snapdragon and 16GB of RAM even if you'll use it with a computer, but they didn't want to splurge five or ten dollars on color cameras. Weird priorities.

The whole front part with the lenses and processors is removable, and there's an expansion connector on the face piece for future accessories, so it's certainly possible that colour cameras could be released later, and be an add-on for the Frame without needing to buy a new device.