> Super awesome as long as your kids never go anywhere they could access a non-locked-down device.

Please describe how requiring a government ID in order to use a computer prevents an over-seventeen from presenting their ID to unlock their computer and then handing that computer over to an under-eighteen? An over-seventeen handing over control of their unlocked computer to a visiting under-eighteen seems to me to be an under-eighteen "go[ing somewhere] they could access a non-locked-down device".

The only way I can see to even begin to combat that is to constantly surveil the operator of the computer to attempt to detect when its operator changes. Do you have a superior method?