I was talking about a specific device on a specific dimension brought up by the GP, i.e., "freedom to tinker for the owner while preserving security for the masses." Whether that became a standardized process is a different story. By and large it has changed across models, but nevertheless it was a good balance of ownership/hackability without compromising security that can be emulated by other devices if they choose to.

There's no specific device under discussion. Where do you want the link to go? Google?