You're right, I do expect owners to have "some sense of knowledge of the device". When someone cuts their finger on a knife, do we blame the manufacturer for it being too sharp? When some fails to lock their front door, do we blame the lock maker when someone opens the door?

While there are times it may be physically impossible for an owner to wipe a device (as I noted in the article), owners need a basic understanding of how the devices they buy function.